EncodersBase64 and URL encode/decode in one place — instant, client-side conversion.JWT DecoderDecode JWT header & payload, inspect claims, optionally verify HS256 signatures.JSON FormatterValidate, pretty-print, and visualize JSON with syntax highlighting.Mermaid LiveWrite Mermaid diagrams and see them render live — pan, zoom, export, and share.MindmapBuild mindmaps with keyboard shortcuts — saved to local storage, export PNG/SVG/JSON.C4 DiagramsWrite Structurizr DSL and render C4 context/container/component diagrams — saved to local storage.ExcalidrawHand-drawn whiteboard — sketch shapes, text, and freedraw; export PNG/SVG. Runs fully in-browser.
apps13 tools · one tab

some tools

A small collection of single-purpose web utilities for developers and makers. Encode, decode, format, diagram, and convert — every tool runs fully in your browser. Nothing is uploaded, no account is needed, and nothing is tracked.

boltInstant — no build steplock100% client-sidevisibility_offNo accounts, no tracking

Encode & inspect

Decode, format, and reason about the data you work with every day.

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Encoders

Base64 and URL encode/decode in one place — instant, client-side conversion.

key
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JWT Decoder

Decode JWT header & payload, inspect claims, optionally verify HS256 signatures.

data_object
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JSON Formatter

Validate, pretty-print, and visualize JSON with syntax highlighting.

Diagrams

Turn text into living diagrams — render, pan, zoom, export, and share.

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Mermaid Live

Write Mermaid diagrams and see them render live — pan, zoom, export, and share.

hub
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Mindmap

Build mindmaps with keyboard shortcuts — saved locally, export PNG/SVG/JSON.

schema
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C4 Diagrams

Write Structurizr DSL and render C4 context/container/component diagrams.

draw
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Excalidraw

Hand-drawn whiteboard — sketch shapes, text, and freedraw; export PNG/SVG, all in-browser.

Files & media

Transform images and tabular data without anything leaving your machine.

ink_eraser
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Remove Background

Cut out the subject of an image. Runs fully in-browser, no upload.

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QR Code Generator

Live QR generator with color, size, and embedded-logo controls.

picture_as_pdf
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Images to PDF

Upload images and download them combined as a multi-page PDF.

data_array
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CSV to JSON

Parse a CSV with optional dotted-key nesting and exception fields.

bookmark
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CSV to Bookmarks

Convert a CSV of name,url pairs into a browser-importable bookmarks file.

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HTML Preview

Render a GitHub-hosted HTML file live in a sandboxed frame — fully client-side.

Loved by enterprises*

What our customers are saying

Real, definitely-not-fabricated feedback from people who have used at least one of these tools, possibly by accident.

★★★★★
“It was a business make plassures with you.”
A Generic Coder GuySr. Engineer, ShipShip Inc.
★★★★★
“I'm a real person. This is a real testimonial. By a real VP.”
Generic Corporate WomanVP of Verticals, Things LLC
★★★★★
“Anyway, as I was saying — best-in-class, this is not AI slop.”
Chad CorporateChief Executive Officer
★★★★★
“Code Monkey like Fritos, Code Monkey very simple man.”
Code MonkeySr. Engineer, ShipShip Inc.

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* No enterprises were consulted. No customers exist. The tools, however, are real and free.