Social Post Character Counter
Check a short post against the standard X limit or a custom character limit before publishing.
All the services you need.Just one dollar a month.
Powered by AI to reduce cost — not value.
New
Recently added tools
The latest five tools added to OneDollarLab.
Date Difference & Offset Calculator
Calculate days between two dates or find dates before and after a chosen day.
Trip Expense Splitter
Split shared travel costs fairly and see who should pay or receive the difference.
Ultrasonic Generator
Attempt very high-frequency playback with a required safety acknowledgement.
Frequency Generator
Play a pure tone at a selected frequency directly in your browser.
Ambient BGM Generator
Generate soft browser-based ambient background music with Focus, Relax, and Sleep modes.
Recently used
Pick up where you left off
The tools you opened most recently will show up here.
Nothing here yet
Open a tool once and it will appear here for quick access.
Our tools
PDF Tools
Merge, rotate, extract, and optimize PDF files in your browser.
PDF Rotate
Rotate all pages or selected pages in a PDF directly in the browser.
PDF Compress
Optimize PDF file size by compressing its internal structure in the browser.
Text Tools
Count, convert, and clean up text for everyday editing work.
Social Post Character Counter
Check a short post against the standard X limit or a custom character limit before publishing.
Character Counter
Quickly check characters, lines, and words in your text directly in the browser.
Half-width / Full-width Converter
Convert between half-width and full-width text for Japanese copy cleanup.
Kana Converter
Convert between hiragana and katakana instantly in your browser.
Line Sort + Dedupe
Sort multiple lines and remove duplicates in one browser-side step.
Line Extract
Filter multiline text to keep only the lines you need.
HTML Tag Removal
Strip HTML tags and turn pasted markup into plain text in your browser.
Newline Removal
Flatten multiline text by removing line breaks or replacing them with spaces.
Line Replace
Find and replace text, including multiline patterns, directly in your browser.
Case Converter
Convert text to lowercase, camelCase, snake_case, kebab-case, and more.
Developer Tools
Small technical utilities for validation, formatting, and debugging.
Base64 Encode / Decode
Convert text to Base64 or decode it back in your browser.
URL Encode / Decode
Encode query values or decode encoded URL text directly in your browser.
HTML Escape / Unescape
Convert special characters to HTML entities or decode them back to text.
UUID Generator
Generate one or many random UUID v4 values directly in your browser.
UUID Version Check
Validate a UUID string and show which version it uses.
UUID Timestamp Extract
Read embedded timestamps from UUID v1, v6, and v7 values.
SQL IN Clause Builder
Turn lists of values into SQL IN clause format in your browser.
Color Converter
Convert HEX, RGB, and HSL values and preview the color instantly.
Utility Tools
Simple helpers for common tasks like QR code creation.
QR Code Generator
Turn text or URLs into a downloadable QR code without leaving the browser.
Batch QR Code Generator
Generate multiple QR codes from line-separated URLs or text and download them together as a zip.
Image Resize
Resize one image into multiple target sizes and download everything as a zip.
Trip Expense Splitter
Split shared travel costs fairly and see who should pay or receive the difference.
Date Difference & Offset Calculator
Calculate days between two dates or find dates before and after a chosen day.
Text To Speech ZIP
Split text by blank lines, generate one MP3 per block, and download the result as a ZIP.
Ambient BGM Generator
Generate soft browser-based ambient background music with Focus, Relax, and Sleep modes.
Frequency Generator
Play a pure tone at a selected frequency directly in your browser.
Ultrasonic Generator
Attempt very high-frequency playback with a required safety acknowledgement.
Pricing