Tools for Technical Writers
Technical writers balance precision with clarity — documenting APIs, writing runbooks, producing developer guides, and maintaining accuracy across fast-moving codebases. These Tools.Fun utilities handle the small but time-consuming tasks: count characters in a field description, create a clean code screenshot, compare two versions of a doc, or format a JSON example. All free, all browser-based.
Character Counter
Count characters, words, sentences, and bytes in any block of text. Essential for writing to specific constraints: meta descriptions (150–160 chars), UI tooltip copy, Twitter/X post limits, Slack notification message limits, and database field descriptions with column-width constraints.
Code to Image
Convert code snippets into clean, syntax-highlighted images with a choice of themes and fonts. Use for blog posts, documentation sites that don't support code blocks, PDF guides, Notion pages, and slide decks where embedding a proper code block isn't possible.
Diff Tool
Compare two versions of a document, code sample, config file, or API response side by side. Useful for tracking what changed between doc versions during review cycles, comparing before/after migration examples, and verifying that a code sample in a tutorial still matches a newer API version.
JSON Formatter & Validator
Format JSON examples in API documentation so they're readable and properly indented. Validate sample request/response bodies before publishing to ensure they're syntactically correct — a malformed JSON example in docs creates support tickets.
URL Encoder / Decoder
Encode URLs in documentation that contain special characters, ensuring links remain clickable and accurate. Decode percent-encoded URLs from API docs and convert them to readable form for plain-text documentation.
QR Code Generator
Generate QR codes for printed documentation, conference handouts, whitepapers, and onboarding guides that link to online versions. QR codes bridge physical documentation with live online resources — useful for printed quickstart cards and help desk knowledge base articles.
RegExp Tester
Verify regex patterns before including them in documentation as examples. Test that documented input validation patterns and search-and-replace examples actually behave as described — incorrect regex examples in tutorials are a common frustration for readers.
Timestamp Converter
Convert Unix timestamps to human-readable dates when documenting APIs that return epoch values. Provides accurate, copy-pasteable examples that readers can verify against their own system time.
Base64 Encoder / Decoder
Decode Base64 values when documenting authentication flows, API key formats, JWT structures, and binary data encoding. Create accurate, readable examples for OAuth tutorials and API credential documentation.
JSON to YAML Converter
Convert JSON config examples to YAML for documentation targeting YAML-first tools (Kubernetes, Helm, GitHub Actions, Ansible). Provide examples in both formats when documenting tools that accept either.
Duplicate Line Counter
Remove duplicate entries from glossary lists, feature comparison tables, and changelog entries. Paste a draft list and instantly identify and remove repeated items before publishing.
Hash Generator
Generate SHA-256 checksums of file download examples for documentation that includes binary asset distribution. Provide verifiable integrity checksums alongside download links — a standard expectation in developer-facing documentation.
Color Converter
Convert brand colour codes between HEX and RGB for design system documentation, CSS custom property references, and style guide articles that must provide values in multiple formats for different audiences.
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