Small tools that open with something already on screen.

Line-by-line comparison with the changed words highlighted inside each edited line.

Pretty-print or minify, with the exact line and column of a syntax error.

Both directions, with type inference, NDJSON, and nested keys flattened to columns.

Twelve cases computed at once, including a Title Case that keeps punctuation.

Segmenter-accurate counts plus readability, keyword density, and channel limits.

Keep the unique lines, the repeated ones, or the one-offs — with occurrence counts.

Emails, URLs, numbers, and your own regex — with capture groups and match context.

UTF-8 correct in both directions, with URL-safe output, line wrapping, and a hex view.

Component, whole-URL, and form rules side by side, with double-encoding detection.

Seeded filler text — the same link reproduces the same copy — as text, HTML, or JSON.

Grade 1 both ways, with correct number runs, capital signs, and dot-grid cells.

WCAG 2.2 ratios on real type, plus the nearest color that passes.

HEX, RGB, HSL, Lab, LCH, and OKLCH at once, with OKLCH nudge sliders.

One brand color becomes an even OKLCH ramp with shape controls.

Dominant colors from a photo, with separation, ordering, and coverage.

Four deficiency models, plus the pairs that collapse into each other.

Drag the stops, click the ramp to add one, compare sRGB against OKLCH.

All 148 CSS names, searchable by name, hex, channel, or hue family.

ICO, SVG, apple-touch-icon, PWA icons and site.webmanifest as a zip — with the mark checked at true 16px.

Open Graph and Twitter card images at 1200×630, previewed as Facebook, X, LinkedIn, Slack and iMessage actually crop and shrink them.

The 1280×640 card GitHub shows when a repository is linked — language dot, stars, light or dark — checked against the 1MB upload limit.

Syntax-highlighted code as a PNG or SVG — themes, window chrome, line numbers — highlighted in your browser instead of on a server.

PWA maskable and Android adaptive icons checked under every launcher mask — circle, squircle, teardrop — against both safe zones.

One square image into an Xcode AppIcon.appiconset with a correct Contents.json, plus Android mipmap densities and adaptive layers.

Deterministic initials and identicon avatars from a name or ID — no API call, batched to a zip, with every avatar's contrast checked.

Padding, gradient background, rounded corners, shadow and window chrome at real destination sizes — with the UI text checked after scaling.

Dummy images with the dimensions burned in — PNG, inline SVG, or a data URI with no service to go down.

Seeded organic blobs, repeating patterns and grain as SVG, PNG, or a CSS background — the same seed always redraws the same shape.

Combine PDFs in your browser and rebuild the bookmark outline the other mergers throw away — with a report of what else the merge costs.

Cut at the bookmarks, by page range, every N pages, or under a file size — with every part built and weighed before you download it.

Click the pages you want out of a document — with their bookmarks renumbered, and the pages you left behind as a second file if you want them.

Turn whole documents or single pages permanently — and find the pages that need it from the direction their text runs, not their shape.

Remove pages — including the blank ones, found by measuring how much of each page is printed rather than by scrolling for them.

Photos and scans onto pages, with the resolution each one will actually print at — and JPEGs embedded untouched rather than recompressed.

Render pages as JPG, PNG, or WebP at any resolution, with the exact pixel size and real byte weight of each one shown before you download.

Re-sample embedded images to the resolution they are actually printed at, with a per-image report — and a plain answer when there is nothing to compress.

Trim audio on a waveform, snap the cut to the nearest silence so it never lands mid-word, and keep the original bytes where the format allows.

Take the sound out of a video as a copy of the original track rather than a re-encode — and see what share of the file it was.

Cut a clip with the frames copied rather than re-encoded — and see how far your in-point sits from the keyframe that decides whether that is possible.

Take the sound off a clip without touching the picture — and choose between dropping the audio track and keeping a silent one, which some uploads require.

Make the GIF, and see what it costs — the tool writes the same seconds as a video too, and puts the two sizes side by side.

Data URIs in both directions, with an inline-or-don't call on the result.

Aspect lock, social presets, and a warning when a target upscales.

A quality ladder with the real byte cost at each of six levels.

PNG, JPEG, and WebP encoded at once so you can pick by size, not by habit.

Drag the box and its corners; presets snap the ratio, corners round the output.

Platform sizes with cover or contain fitting and a click-to-set focal point.

EXIF, IPTC, and GPS grouped by what they reveal — then stripped on export.

Text or logo, dragged into place, tiled or single, at any opacity.

Presets and manual adjustments with a wipe between before and after.

Colours, logo overlay, and the module size in mm against the printable floor.

Every direction of the question: of, change, reverse, and compounding.

Mean, median, quartiles, deviation, and the values flagged as outliers.

Bases 2–36 on BigInt, so conversion stays exact well past 2⁵³.

Decimals to simplified fractions and back, repeating digits included.

Every rule side by side — half-up, banker's, floor, ceil, truncate, step.

Deterministic Miller–Rabin to 10¹⁸, with the nearest primes either side.

Any list of integers, with prime factors and the Euclidean steps shown.

Exact n!, permutations, and combinations — no floating-point overflow.

Both directions, with validation and the additive breakdown spelled out.

Bulk draws from the crypto RNG, with unique, sorted, and stats options.

Income against categories, with the savings rate and the pressure points.

Recurring contributions, contribution timing, and a year-by-year schedule.

Snowball against avalanche on your actual balances and APRs.

ROI and annualised return after dividends, fees, and tax, plus breakeven.

Payment, total interest, payoff date, and what an extra payment buys.

All-in payment: principal, interest, taxes, insurance, HOA, and PMI.

Contributions, growth, and inflation against the income you will need.

The monthly amount a target needs, with growth and checkpoints.

Tip, split, and rounding — with common percentages side by side.

POSIX and AWS syntax, every field explained, next runs in your zone.

Matches, capture groups, replacement preview, and snippets per language.

Claims and expiry decoded locally; HMAC signatures verified in the page.

UUID v4/v7, ULID, NanoID, CUID in bulk, with embedded timestamps decoded.

Seconds or milliseconds detected by digit count, then read out every way.

A world clock plus a rail showing where working hours actually overlap.

Working days between dates, or a date N business days out, holidays included.

18 tested patterns — paste a sample and the library reorders by what matched.

What each code means, when to send it, and what a client does next.

111 TCP/UDP ports with exposure verdicts, firewall rules, and Nmap checks.

109 media types, and a finder that runs real content negotiation on a header.

500 extensions identified from a filename, a URL, or a media type.

Permissions, obligations, reciprocity, and patent terms compared directly.

All 148 names by hue and tone, with nearest match and contrast pairs.

542 characters with entity, code point, CSS escape, and keyboard entry.

33 standards in mm and inches, plus pixels at any print resolution.

241 profiles: ISO and dialing codes, capitals, neighbours, and local time.

A timed test over prose, punctuation, numbers, or code that names the keys costing you time.

Addition, subtraction, multiplication, division, squares, and percentages, with a method behind every answer.

97 countries, their capitals, and their flags on an interactive world map, filtered by region.

45 snippets: predict the output, then step through the execution trace one value at a time.