Tools
Everything runs in your browser. No data is sent anywhere.
Indent, validate or minify JSON right in your browser.
Encode and decode Base64 without sending anything online.
Encode and decode URL components, parameters and special characters.
Convert a Unix timestamp to a readable date, and back.
Compute SHA-1, SHA-256, SHA-384 and SHA-512 without sending anything.
Inspect the header and payload of a JSON Web Token, without verifying the signature.
Strong passwords with custom length, uppercase, digits and symbols.
Interactive HSL wheel with live HEX, RGB, HSL and OKLCH conversions.
Compose one or several CSS shadows with a live preview.
Build linear, radial and conic gradients with a live preview.
Generate cryptographic UUID v4, copy in one click.
Create a QR code from text or a URL, downloadable as PNG or SVG.
Replay a text at the generation speed of an LLM, adjustable in tokens per second.
Count and visualise the token split, with the real tokenizers.
Split a document into chunks and see the overlaps live.
See what temperature, top-p, top-k and min-p actually do to the distribution.
Price an LLM bill per call, per day or per month, cache and batch included.
Lay out system prompt, tools, history and documents inside the context window.
Estimate a local model's VRAM: weights, KV cache, activations and overhead.