45 tools available
DevArms
Arm yourself with the right tools. Decode JWTs, convert JSON/YAML, generate hashes, and more — all client-side and privacy-first.
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45
Tools
9
Categories
100%
Client-side
PDF & Documents
12 tools
PDF Editor
Upload a PDF and add text, draw, sign, attach images, delete pages, then download
PDF Merger
Merge multiple PDF files into a single document with drag-and-drop reordering
PDF Splitter
Extract specific pages or split a PDF into separate files
Image to PDF
Convert JPG, PNG, or WEBP images into a single PDF document
PDF Watermark
Add a diagonal text watermark to every page of a PDF
PDF Metadata Editor
View and edit PDF metadata — title, author, subject, and keywords
Invoice Generator
Generate professional invoices as downloadable PDF documents
DOCX Converter
Convert Word documents (.docx) to HTML or plain text
PDF to Image
Convert PDF pages to PNG or JPEG images with adjustable scale
PDF Page Rotate
Rotate individual pages or all pages of a PDF document
PDF Password
Add password protection or remove restrictions from PDF files
HTML to PDF
Convert HTML or Markdown content into a downloadable PDF document
Encoders / Decoders
4 tools
Converters
6 tools
JSON <> YAML
Convert between JSON and YAML formats
JSON <> XML
Convert between JSON and XML formats
JSON <> CSV
Convert between JSON arrays and CSV
JSON <> TOML
Convert between JSON and TOML formats
YAML <> TOML
Convert between YAML and TOML formats
Number Base Converter
Convert numbers between binary, octal, decimal, and hexadecimal
Text
5 tools
Case Converter
Convert text between camelCase, PascalCase, snake_case, kebab-case, and more
Text Diff
Compare two texts and see the differences highlighted
Markdown Preview
Write Markdown and preview the rendered HTML output
Lorem Ipsum Generator
Generate placeholder text for your designs
Word & Character Counter
Count words, characters, sentences, and paragraphs
Generators
4 tools
Validators
3 tools
Date / Time
4 tools
Epoch / Unix Timestamp
Convert between Unix timestamps and human-readable dates
Cron Expression Parser
Parse and explain cron expressions, see next run times
Time Unit Converter
Convert between milliseconds, seconds, minutes, hours, days, weeks, months, and years
World Clock
See the current time in cities around the world with live updates
Formatters
2 tools
Markdown & Docs
5 tools
Markdown Editor
Full-featured StackEdit-like editor with toolbar, shortcuts, and export to HTML/PDF
Markdown Table Generator
Visual table builder with alignment controls and CSV import
HTML to Markdown
Convert HTML content to clean Markdown with configurable options
Mermaid Diagram Editor
Create flowcharts, sequence diagrams, and more with live preview
README Generator
Generate professional README.md files with templates and badges