30+ Free Browser Tools Every Developer Needs in 2026

We all end up pasting JSON into throwaway websites, converting timestamps in our heads, and installing formatters for things that should take five seconds. I got tired of the tab-spam, so I built an open toolkit: 50+ free utilities and mini-games that run 100% in your browser. No installs, no sign-ups, no telemetry — everything is client-side, which also means it works offline once loaded.

Here's the list, grouped by what they actually do. Everything is free; if you find them useful, a ☕ ko-fi helps keep the site ad-free.

🛠 Text & Code

Tool	What it does
JSON ⇄ CSV Converter	Two-way conversion with smart schema detection
YAML ⇄ JSON Converter	Full YAML subset parser, comments and flow arrays included
JSON Formatter	Format, minify and tree-inspect JSON
XML Formatter	Pretty-print preserving comments, CDATA and doctype
SQL Formatter	Clause-aware SQL beautifier (no dependencies)
HTML Minifier	Shrink HTML safely (protects pre/code/script)
HTML ⇄ Markdown	Convert between HTML and Markdown both ways
Regex Tester	Live regex with named groups and flags
Case Converter	camelCase, snake_case, kebab-case, PascalCase…
Slug Generator	URL-friendly slugs from any text
Lorem Ipsum Generator	Paragraphs, sentences, words, HTML-wrapped

🔐 Encoding & Security

Tool	What it does
Hash Generator	MD5, SHA-1, SHA-256, SHA-512, HMAC
JWT Decoder	Decode & validate tokens locally
Base64 Encoder/Decoder	Text ↔ Base64 + data URIs
Password Generator	Strong passwords with entropy display
Password Strength	Honest entropy-based strength scoring
HTTP Status Codes	Every code with categories and hints

🎨 Design & CSS

Tool	What it does
Color Converter	HEX/RGB/HSL/CMYK with palettes
CSS Gradient Generator	Linear & radial gradients with presets
Box Shadow Generator	Offset/blur/spread/inset with live preview
Color Contrast Checker	WCAG AA/AAA compliance, live preview

➗ Math & Time

Tool	What it does
Percentage Calculator	All three percentage operations + X% of Y
Random Number Generator	Crypto-secure, unique draws, dice & coins
Unix Timestamp Converter	Epoch ⇄ human with timezones

🎮 Games & Focus (work/play balance matters)

Tool	What it does
Reaction Time Test	Measure & train your reflexes
Typing Speed Test	WPM/accuracy with leaderboard-ish stats
Simon Says	Memory sequence game with shareable score
Daily Word Puzzle	Wordle-style, one puzzle per day
Pomodoro Timer	25/5 cycles with stats and notifications

📚 Bonus: the guides

Beyond tools there are longer explainers — MD5 vs SHA-256 (why MD5 is broken), Base64 explained, WCAG contrast explained and a YAML vs JSON deep dive.

Why browser-native?

• Privacy: your data never leaves the machine. The Random Number Generator uses crypto.getRandomValues, the hash generator computes on-device, the JWT decoder decodes locally.
• Always up to date: I ship improvements daily — there are now 50+ pages and 30+ interactive tools, plus searching on the homepage if you want to find something specific.
• Zero cost: open project, no accounts, no paywalls. If it saves you a few minutes a week, that's the point.

Bookmark it: pyfile-toolkit.github.io/web-toolkit/

If this list helped, consider a ☕ ko-fi tip — it keeps the whole thing ad-free and funded.