Every tool
Every tool here runs entirely on your device. No uploads, no server processing, ever. Use the search in the header, or browse the categories below.
PDF Tools 19
Category pageMerge, split, compress, sign and convert PDF files without uploading a single page.
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Combine several PDF files into a single document.
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Cut one PDF into several smaller documents.
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Shrink a PDF by re-encoding the images inside it.
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Turn photos and scans into one PDF document.
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Render PDF pages to JPG or PNG images.
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Turn pages the right way up and save them that way.
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Remove the pages you do not want and keep the rest.
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Drag pages into the order you actually want.
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Pull selected pages into a new PDF.
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Stamp page numbers in the position and format you want.
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Stamp text or an image across every page.
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Draw, type or upload a signature and place it on the page.
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Pull the text out of a PDF, page by page.
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Encrypt a PDF with a password, locally.
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Decrypt a PDF you have the password for.
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Trim the margins off PDF pages.
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Print 2, 4, 6 or 9 pages on a single sheet.
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Read, edit or strip the hidden information in a PDF.
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Convert pages to A4, Letter or any custom size.
Image Tools 22
Category pageCompress, resize, crop and convert photos with Canvas — the fastest tools on the site.
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Make images smaller with a quality slider you control.
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Hit an exact file size limit, like 100 KB or 2 MB.
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Change pixel dimensions, by size or by percentage.
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Convert between JPG, PNG, WebP, AVIF and BMP.
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Cut an image to the exact area you want.
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Open iPhone photos on any device.
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Convert to and from WebP.
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Turn or mirror an image and save it that way.
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Fit a photo to official ID dimensions and size limits.
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Turn an image into a data URI you can paste into code.
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Every favicon size plus the HTML to drop in.
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See everything a photo says about itself.
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Strip GPS and camera data before you share a photo.
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Put your name or logo on your photos.
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Cut an image into a grid of tiles.
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Top and bottom text on any image, done properly.
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Hide faces, plates and personal details in a picture.
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Rasterise vector graphics at any resolution.
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Grab exact colours out of any picture.
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Round profile pictures with a transparent background.
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Frames, padding and social-safe square canvases.
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Decode a data URI back into a real image file.
Calculators 30
Category pagePercentages, loans, dates, mortgages and statistics, with the formula always shown.
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Every percentage question in one place.
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Exact age in years, months and days.
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Monthly payment, total interest and full amortisation.
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The real monthly cost, not just principal and interest.
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Growth over time, with regular contributions.
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Final price, amount saved, and stacked discounts.
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Tip, total, and the split per person.
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How long between two dates, in every unit.
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Add and subtract hours, minutes and seconds.
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Weighted GPA, semester averages and what you need on the final.
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A real expression calculator with a safe parser.
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Convert between hourly, daily, weekly, monthly and yearly pay.
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A live countdown to any date.
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Add, subtract, multiply and divide fractions — with the steps.
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Mean, median, mode, range and sum from a list of numbers.
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Variance, standard deviation and the rest of the summary.
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Add tax, remove tax, or find the rate.
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Roots, discriminant, vertex and the worked steps.
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Return on investment, margin, markup and payback.
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Pace, time and distance for runners.
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Work out what to save each month to hit a target.
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Compare avalanche and snowball across all your debts.
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Project a pension pot and the income it pays.
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Cost a journey in litres per 100 km or mpg.
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See what an appliance costs to run.
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Split a bill evenly or by what each person had.
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How much paint a room needs, and how many tins.
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Tiles, boxes and wastage for a floor or a wall.
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What you need on the final, and what it gets you.
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The right screen for your sofa, and the width it needs.
Health & Body 15
Category pageBody measures, energy needs, cycles and sleep — every formula named, and none of it sent anywhere.
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Body mass index in metric or imperial, with the caveats.
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Estimated daily energy needs, with the error bars stated.
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US Navy and BMI-based estimates, with their error range.
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Due date from a period, a scan or an IVF transfer.
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Next periods and fertile window, on a calendar.
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A Widmark estimate of BAC, with the legal limits.
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AHA and ESC categories from averaged readings.
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Du Bois, Mosteller, Haycock and Boyd side by side.
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Lab units between mg/dL and mmol/L, both ways.
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How much water a day, from weight and activity.
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Bedtimes and wake times in whole sleep cycles.
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Basal rate and daily calories, by three equations.
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Split daily calories into protein, carbs and fat.
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Four ideal weight formulas, and how far they differ.
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Five training zones from age or a measured maximum.
Converters 10
Category pageUnits, temperature, time zones, data sizes and number systems.
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Length, weight, volume, area, speed, pressure and more.
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Celsius, Fahrenheit, Kelvin and Rankine at once.
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Bytes to KB, MB, GB, TB — decimal and binary.
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What time is it there, and when should we meet?
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Spell out amounts for cheques and contracts.
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Keep proportions right when resizing.
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Convert between any bases from 2 to 36.
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Arabic to Roman and back, both directions.
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Cups to grams, with the ingredient taken into account.
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UK, US, EU and Japanese sizes, with the measurements.
Text Tools 21
Category pageCount, compare, clean, transform and read text aloud.
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Words, characters, sentences and reading time as you type.
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UPPERCASE, lowercase, Title Case, camelCase and more.
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See exactly what changed between two texts.
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Unwrap text that was pasted from a PDF or an email.
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Deduplicate a list, and see what was removed.
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Alphabetical, numeric or natural sorting.
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Bulk replace, with regex and capture groups if you want.
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Placeholder text in classic Latin or plain English.
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Read text aloud with the voices on your device.
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Unicode styles that work in bios and usernames.
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Clean, readable URLs from any title.
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Strip diacritics while keeping the letters.
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Flesch-Kincaid and five other readability formulas.
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Word frequency and phrase counts for a page of text.
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Convert Markdown with a live preview and safe output.
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A distraction-free scratchpad that survives a refresh.
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Text to Morse and back, with sound.
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Repeat a string any number of times.
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Flip text by character, word or line.
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Strip tags and keep the readable content.
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Find and copy any emoji or symbol.
Developer Tools 23
Category pageJSON, Base64, hashes, regex, JWT and the rest of the daily toolkit.
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Format, validate, minify and explore JSON.
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Encode and decode Base64, including UTF-8 and URL-safe.
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Percent-encoding, done with the right function.
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SHA-256, SHA-512, SHA-1 and MD5 for text or files.
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Bulk v4, v7 and NIL UUIDs from a real CSPRNG.
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Read the header and payload of a token — locally.
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Flatten nested JSON into a spreadsheet-ready table.
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Parse messy CSV into clean JSON.
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Re-indent HTML, CSS, JavaScript, JSON and XML.
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Strip whitespace and comments from CSS, JS and HTML.
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Make a long query readable.
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Convert both directions, and catch indentation errors.
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Test patterns with live highlighting and an explanation.
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Epoch seconds and milliseconds to readable dates.
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Indent, validate and minify XML.
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Read a cron expression in plain English.
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Text to binary, hex, octal and decimal, and back.
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Escape HTML safely, or decode entities back.
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CIDR ranges, masks and usable hosts.
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Octal, symbolic and checkbox — all three in sync.
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Verify a download against its published checksum.
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Encrypt a note with a passphrase, in your browser.
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Classic letter-shift ciphers, with brute force.
Design & Color 8
Category pageColour conversion, palettes, gradients, shadows and accessibility checks.
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HEX, RGB, HSL, HWB, LAB and OKLCH in one view.
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Build a gradient visually and copy the CSS.
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Harmonies, scales and export in every format.
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Layered shadows with a live preview.
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WCAG 2 ratios and APCA, with fixes suggested.
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Rounded corners, including the organic blob shapes.
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Fluid typography that scales between two viewports.
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See a design as 8% of men do.
Generators & Security 19
Category pageQR codes, passwords, UUIDs, signatures, invoices and random pickers.
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Free, permanent QR codes with no tracking redirect.
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Scan from your camera or from an image file.
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EAN, UPC, Code 128 and Code 39 as PNG or SVG.
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Strong random passwords and passphrases.
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Honest entropy and crack-time estimates.
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Fair random numbers in any range.
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Roll any dice, with modifiers and advantage.
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A spinning wheel that picks fairly.
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Shuffle a list properly, or split it into teams.
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Draw or type a signature and export it transparent.
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A clean PDF invoice, built in your browser.
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Campaign URLs that stay consistent.
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Title, description, Open Graph and Twitter cards.
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Crawl rules, including the AI crawlers.
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Heads or tails, and the statistics of a run.
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One source, five styles, correct punctuation.
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Split a list of names into fair teams.
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Draw Secret Santa pairs with exclusions.
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Placeholder images at any size, drawn locally.
Utilities & Media 14
Category pageTimers, recorders, device tests and archive tools that use your hardware directly.
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A countdown timer that keeps time in a background tab.
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Start, stop and lap times to the hundredth.
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Focus intervals with breaks, and a session count.
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Bundle files into a ZIP without uploading them.
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Open a ZIP and pull out what you need.
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Record your screen straight to a file.
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Record audio from your microphone and save it.
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Check your camera before the call starts.
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See your levels and hear yourself back.
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Find the key that stopped working.
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Full-screen colours to find dead pixels and backlight faults.
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What your browser reveals about you.
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Words per minute, scored per character.
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Measure your reaction time over several rounds.
Office & Productivity 25
Category pageSpreadsheets, CSVs, timesheets, labels and the small jobs that eat an office afternoon.
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Turn an .xlsx workbook into CSV files.
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Turn CSV or pasted rows into a real .xlsx workbook.
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Open, sort, filter and fix a CSV without a spreadsheet.
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Stack CSV files together, or join them on a shared column.
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Cut a large CSV into smaller files that keep the header.
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Find and remove duplicate rows in a CSV or a list.
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Split delimited or fixed-width text into columns.
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Fix text pasted out of Word, a PDF or an email.
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Build an HTML signature that survives Outlook.
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Merge a CSV of recipients into a message template.
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Pull email addresses, URLs or numbers out of any text.
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Split full names into first, middle and last columns.
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Work out what a meeting actually costs.
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Find a meeting time that works across time zones.
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Count business days, or find a deadline.
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Add up a week of hours, breaks and overtime.
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Convert 7:45 to 7.75 and back, a column at a time.
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Add or remove VAT, GST or sales tax from an amount.
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Convert between margin and markup, with the formulas.
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How many units cover your fixed costs.
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Print sheet labels from a list, as a PDF.
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Make an .ics file any calendar app will import.
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Build a .vcf contact file, with a QR code.
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Find identical files by content, not by name.
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Weigh the criteria, then rank the options.
Why we don't have these tools
Every tool below has real demand — several of them have more search volume than anything in our catalog. None of them can run entirely on your device, so none of them are here. The rule only means something if it has no exceptions.
| Tool | Demand | Why it is not here |
|---|---|---|
| PDF to Word / Excel / PowerPoint | ~4.0M searches/month | Rebuilding a page layout as a DOCX needs a conversion engine that does not exist in usable form in a browser. JavaScript attempts produce output nobody would send to a client. |
| Word / Excel to PDF | ~2.5M searches/month | It needs a full office suite to render the document. LibreOffice compiled to WebAssembly is still hundreds of megabytes and unstable for production use. |
| Translate text | ~30M searches/month | Machine translation needs a model far larger than anything reasonable to download, or an API call. Either way your text leaves the device. |
| Currency converter | Very high | Exchange rates change by the second and must come from a live feed. A cached rate is stale data presented as fact, which is worse than not having the tool. |
| Internet speed test | ~8.6M searches/month | Measuring throughput requires a remote endpoint to push bytes to and from. There is nothing to measure against locally. |
| IP lookup, WHOIS, DNS, ping | Very high | These are network queries a browser is not permitted to make directly, and the answers live in remote registries. |
| YouTube / video downloader | Very high | Needs a server to fetch and remux the stream, and carries legal exposure we are not interested in. Cut twice over. |
| Plagiarism / AI detector / grammar checker | Very high | Needs either a search index of the web or a language model on a server. Also: AI-detection tools are unreliable enough that offering one would be irresponsible. |
| SEO audit, backlink or DA checker | High | The whole product is proprietary crawl data held by someone else. There is nothing to compute locally. |
| URL shortener, temp mail, email sender | High | Each needs persistent server state — a redirect table, a mailbox, an SMTP relay. A client-side version is a contradiction in terms. |
| Weather, stock and crypto prices | Very high | Live data from an API. Same reason as currency conversion. |
| Video converter / compressor | High | Technically possible with ffmpeg compiled to WebAssembly, but the core alone is around 31 MB, the multithreaded build needs cross-origin isolation headers that break other things, and 32-bit WASM caps memory in a way that makes large files unsafe. Under review as an isolated sub-path, not as a catalog item. |
| OCR / image to text | Very high | On the roadmap rather than excluded. A browser OCR engine is roughly 12 MB per language and noticeably worse than server OCR — it will ship when it can be offered honestly, with the download cost stated up front. |
| Background remover | Very high | Also on the roadmap. The segmentation models that do this well are 40-80 MB. It is the single biggest differentiation opportunity here, and it needs to be built carefully rather than quickly. |