45 tools · 100% client-side · no sign-up
Format JSON, minify code, decode a JWT, generate a hash or convert a colour — 45 free tools that run entirely on your machine. Nothing you paste is uploaded or logged.
The ones people reach for most often.
Decode Base64 back to text — accepts both alphabets and any line wrapping automatically.
Encode any text to Base64 — full UTF-8 support, with optional URL-safe output.
Convert between twelve naming conventions — camelCase, snake_case, kebab-case, Title Case and more.
Count characters against the limits that matter — SEO titles, meta descriptions, X, SMS — with correct emoji handling.
Convert a colour between every common format — including OKLCH — with WCAG contrast ratios included.
Pick a colour visually and get every format, a tint/shade ramp and live WCAG contrast feedback.
Expand and tidy stylesheets with consistent indentation and spacing.
Convert CSV, TSV or any delimited text to JSON with correct handling of quotes, commas and embedded newlines.
Generate MD5, SHA-1, SHA-256, SHA-384 or SHA-512 digests in hex or Base64, computed locally.
Nine categories, from JSON and formatters to cryptography and colour.
Every tool runs in your browser. Your JSON, tokens and passwords never touch a server — ours or anyone else’s.
No round-trip, no queue, no rate limit. Output updates as you type, and heavy libraries load only for the tool that needs them.
Because the logic is client-side, a tool keeps working once its page has loaded — useful on a plane or a bad connection.
No account, no email wall, no free-tier limits. Open the page and use it.
Guides and deep dives on the things these tools touch.
An honest assessment of AI coding tools — the tasks they are genuinely good at, the failure modes to expect, and a review checklist for generated code.
The TweakPad Team
How context windows work, what tokens actually cost, the lost-in-the-middle effect, and practical strategies for fitting a real codebase into one.
The TweakPad Team
Which computer-science fundamentals genuinely pay off in application work — complexity, data structures, concurrency and naming — and which are safely skippable.
The TweakPad Team
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