Small tools. No tracking.
45 free utilities that run in your browser. No accounts, no cookies, no tracking, just the tool.
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New since your last visit
Worked out in your browser from the date of your last visit, which is kept only here (local storage). We never see it. Prefer a feed reader? Use the guides feed.
Your toolbelt
Data & formats
What Is This? Data Type Detector
Paste any mystery string: tokens, hashes, timestamps, cron, colours, Base64. It names it and opens the right tool.
JSON Formatter & Validator
Pretty-print, minify, sort keys and validate JSON with exact error positions.
CSV to JSON Converter (and JSON to CSV)
Convert CSV to JSON and back, with delimiter detection, types, nesting and a table preview.
YAML to JSON Converter (and JSON to YAML)
Convert YAML to JSON and back, with clear errors, anchors, multi-document files and gotcha warnings.
SMART Report Explainer (is my hard drive or SSD failing?)
Paste smartctl, CrystalDiskInfo or PowerShell drive health output and get a plain-English verdict on every reading.
Image Compressor & Resizer (never uploaded)
Shrink one photo or a batch of 50 in your browser: quality, resize, target size, JPEG/WebP/PNG, one ZIP. Nothing is uploaded, and hidden location data is stripped.
Batch Photo Rotator (never uploaded)
Turn a pile of sideways photos the right way up: previews, a turn per photo, undo, then download copies as one ZIP. Optional lossless JPEG mode.
Photo Metadata Viewer & Location Remover (EXIF)
See what a photo secretly says (where, when, which phone) and save a copy without the location. Lossless, never uploaded.
QR Code Scanner from Image or Screenshot
Read a QR code from a screenshot, photo or your camera, and see where a link really goes before you open it.
Screenshot Redactor: Black Out Text in a Picture
Cover names, numbers and passwords in a screenshot with solid boxes or crop them out, then save a flat copy. Never uploaded.
Encoding & security
Base64 Encode & Decode
Encode text or files to Base64, decode back, with URL-safe mode and data URIs.
URL Encoder & Decoder
Percent-encode or decode URLs and inspect every part and query parameter.
Set-Cookie Header Explainer & Cookie Checker
Paste a Set-Cookie header to see every attribute explained, why a browser rejects it, and whether it will be sent.
Content-Security-Policy (CSP) Header Explainer & Checker
Paste a CSP header to see each directive in plain words, the weak spots, what gets blocked, and the hash for an inline script.
X-Frame-Options & frame-ancestors Explainer
Paste X-Frame-Options or CSP frame-ancestors to see who can iframe the page, with a clickjacking simulator.
robots.txt Tester
Paste a robots.txt and a path to see if a crawler is Allowed or Disallowed, with the matching rule.
Hash Generator (SHA-256, SHA-512)
SHA-1, SHA-256, SHA-384 and SHA-512 of text or files, plus checksum verification.
JWT Decoder
Decode JSON Web Tokens locally and check expiry, issuer and claims.
Text
Regex Tester
Test JavaScript regular expressions with live highlighting, groups and replace.
Text Diff
Compare two texts line by line and see exactly what changed.
Word & Character Counter
Words, characters, sentences, reading time and most used words, live.
SMS Length Counter (160 vs 70 characters, parts, emoji and curly quotes)
See how many texts a message will be sent as, which characters drop you to 70 per text, and swap them for plain ones.
Markdown Editor & Live Preview
Write Markdown with a live preview, outline and checks, then copy HTML or formatted text. Converts HTML back too.
Case Converter
camelCase, snake_case, kebab-case, Title Case and more in one go.
Batch File Renamer (names only, never uploaded)
Rename many files with a before/after preview, clash protection and drag-to-order numbering. Only names are used; you get a script to run.
Numbers & colour
Broadband Speed Calculator (how many Mb/s does my household need?)
Add up what your household streams, calls and plays at the busiest moment, see the download and upload speed you need, and check your plan.
Input Lag Calculator (controller, mouse and TV lag in ms)
Add up the lag from button press to picture: polling, Bluetooth, frame rate, V-Sync, refresh rate and TV game mode, then see what would help most.
Colour Converter & Contrast Checker
Convert HEX, RGB, HSL and OKLCH, build tint scales and check WCAG contrast.
Number Base Converter (Binary, Hex, Octal)
Convert between binary, octal, decimal, hex and any base, with two's complement and a clickable bit view.
Unit Converter (length, mass, temperature, KB vs KiB, Mbps vs MB/s)
Convert length, mass, temperature, data sizes and internet speeds (Mbps vs MB/s), with download-time and how-much-can-I-send calculators.
Percentage Calculator
What is X% of Y, what % is X of Y, percent change, apply ±%, or undo a markup — all in your browser.
Streaming Data Calculator (GB per hour, will my data last?)
How many GB an hour of video, music or calls uses, and whether your monthly data plan lasts, with the day it runs out.
Video File Size Calculator (MB per minute, how much fits, shrink to a limit)
How big a video will be at 1080p or 4K, how many minutes fit in your free space, and the bitrate to squeeze it under a size limit.
GIF Size Calculator (estimate, fit under a limit, ffmpeg commands)
Estimate how big an animated GIF will be, see how much smaller it would be as MP4 or WebP, and get settings that fit under a size limit.
Power Bank Calculator (mAh to Wh, real charges, flight limit)
How many phone, tablet or laptop charges a power bank really gives, the mAh-to-Wh sum, the size you need and whether it can fly.
Time
Time Zone Meeting Planner
Line up cities hour by hour, find a meeting time that suits everyone and copy it for the invite.
Unix Time Converter
Convert epoch seconds or milliseconds to dates and back.
Date Difference Calculator (age, duration, ISO weeks)
How far apart are two dates? Age, signed duration, ISO 8601, ISO weeks and DST warnings — in your browser.
Countdown: Days and Sleeps Until Any Date
How many sleeps until Christmas, the weekend or any date: calendar days, nights, weekdays vs weekend days, time left and a star-per-night strip.
Bank Holidays (UK, IE, US, DE, FR, NL, Canada, Australia, NZ) + Calendar Feed
Every bank holiday for the UK nations, Ireland, US, Germany (any Bundesland), France, Netherlands, Canada (any province), Australia (any state) or New Zealand, with a countdown and a calendar subscribe link.
Cron Expression Explainer
Translate cron schedules into plain English and list the next run times.
Generators
UUID Generator (v4 & v7) & Password Generator
UUID v4 and time-ordered v7, a UUID inspector, and strong passwords.
QR Code Generator
Links, Wi-Fi, contact cards, email, SMS and map pins as crisp SVG/PNG QR codes, drawn in your browser.
Wi-Fi QR Code Generator
Guests scan once and they're on your Wi-Fi. Password never leaves your browser.
Lorem Ipsum Generator
Classic placeholder paragraphs, sentences or words — with optional seed for repeatable samples.
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Guides
Developer API
A tiny, stateless JSON API with no keys and no logging: /api/health, /api/uuid?n=5, /api/password?length=24, /api/time?ts=1700000000 and /api/qr?text=hello (SVG). POST /api/detect with {"text": "..."} classifies a string (rate limited).