Free Online Tools for SEO, Text, Images & Developers
ToolsDiary gives you practical browser-based tools for SEO, marketing, writing, development, images and video. Use them free with no unnecessary sign-ups, and get clear results with helpful explanations.
Popular Free Online Tools
Start with some of our most useful tools. Every tool listed here is ready to use now.
UTM Campaign URL Builder
Create clean campaign URLs with UTM parameters for analytics and attribution.
SEO Meta Tag Preview
Preview a page title and meta description before publishing.
SEO Slug Generator
Turn a title or phrase into a clean, readable URL slug.
Keyword Density Analyzer
See repeated words and phrases in text without encouraging keyword stuffing.
Word & Character Counter
Count words, characters, sentences, paragraphs and estimated reading time.
Text Case Converter
Convert text to upper, lower, title, sentence or alternating case.
Text Cleaner
Remove extra spaces, blank lines, smart quotes and common copy-paste clutter.
Duplicate Line Remover
Remove repeated lines while preserving the first occurrence and original order.
Video Compressor
Compress video files in your browser, reduce file size with quality and resolution presets, and compare the result before downloading.
Text, supported image and video tools run directly in your browser whenever practical, reducing unnecessary uploads and keeping everyday tasks simple.
Tools include practical guidance, examples, limitations, tips and FAQs so you can understand the result instead of only receiving an output.
ToolsDiary is organized around clear categories, responsive pages and a modular structure so new useful tools and guides can be added over time.
Practical Guides for Better Results
Go beyond the button. These guides explain the decisions, trade-offs and practical workflows behind common SEO, marketing, privacy and performance tasks.
Image Optimization for Faster Websites: Size, Dimensions and Format
Reduce image weight without turning useful photos and graphics into blurry assets.
Video Compression vs Resizing: How to Prepare Videos for Social Media
Learn the difference between compressing a video and resizing its dimensions, when to downscale or crop, and how to prepare practical versions for social media and web uploads.
VideoHow to Write Better AI Video Prompts: A Practical Guide
Learn how to structure AI video prompts for text-to-video and image-to-video tools using clear subject, action, camera, timing, style and continuity instructions.
PlanningHow Much Can You Make From a Side Hustle? A Practical Earnings Guide
Estimate side-hustle earnings with realistic weekly hours, effective hourly rates, costs and income targets instead of relying on headline promises.
DevelopmentJSON Formatting and Validation: How to Find Errors Without Guessing
Learn the difference between formatting and validation, diagnose common JSON syntax errors, and verify data before using it in an API or application.
More topics are available in the complete guides library →
Useful tools without the clutter
ToolsDiary combines useful online tools with clear supporting information. Instead of giving you only a box and a button, each tool is designed to help you understand what the result means and how to use it.
Many tools process information directly in your browser where practical. That keeps common tasks fast and reduces unnecessary data transfers. When a tool has an important limitation, the page explains it clearly.
We are continuously expanding ToolsDiary with practical tools and original guides for SEO, marketing, text, images, video, development and everyday web tasks, while keeping the experience simple and easy to navigate.