Developer tools that never see your data
Convert, decode, format and diff — every byte stays in your browser. No uploads. No login. No server. Just paste and go, even with files too large or too sensitive to hand an AI.
Data tools
JSON Formatter & Validator
Beautify, minify and validate JSON. Pinpoints errors by line and column. Sort keys for clean diffs.
JSON ⇄ CSV Converter
Two-way convert between JSON and CSV. Streams large files in-browser. Flattens nested objects.
Base64 Encode / Decode
Encode/decode text, files and images. Unicode-safe, URL-safe variant, data URIs, image preview.
Image Compressor & Converter
Compress, convert and resize JPEG/PNG/WebP on a canvas. Quality slider, size comparison. Never uploaded.
YAML ⇄ JSON Converter
Two-way YAML/JSON conversion with multi-document support, type fidelity and validation.
JWT Decoder & Verifier
Decode header/payload and verify HS/RS/ES/PS signatures locally — secrets never leave your machine.
Diff Checker (Text & JSON)
Line-by-line text diff and structural JSON diff with added/removed highlighting. All local.
Hash & Checksum
MD5, SHA-1, SHA-256/384/512 of text or files. Verify a checksum in one step. All client-side.
X.509 Certificate & CSR Decoder
Paste a PEM cert or CSR and read subject, issuer, SANs, validity and fingerprints — locally.
Why run tools locally?
In the AI era it's tempting to paste everything into a chatbot. But for real, sensitive, or large data that's a mistake: production logs, customer CSV exports, JWTs with live secrets, private keys — none of that should travel to a third-party model that may log, train on, or hallucinate over it.
Every tool on gitime.dev runs as plain JavaScript inside your browser tab. Your input is parsed by deterministic, battle-tested libraries — the same answer every time, with no network request and no account. Close the tab and the data is gone.