All tools
Every tool on OneStopWebTools, grouped by category. Search by name or by what you want to do — “shrink”, “count”, “validate” — then narrow by category or sort alphabetically.
40 tools
SEO & Digital Marketing Tools8
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Meta Tag Analyzer
Audit titles, descriptions, canonicals, Open Graph and more from page HTML. -
SERP Snippet Preview Tool
See how a title and description may look in search results. -
Keyword Clustering Tool
Group a keyword list into topic clusters by shared words. -
Robots.txt Generator
Build a robots.txt file and test paths against its rules. -
XML Sitemap Builder
Turn a list of URLs into a valid sitemap.xml file. -
UTM Link Builder
Add correctly encoded UTM campaign parameters to any link. -
Keyword Density Checker
Count how often words and phrases appear in a piece of text. -
Internal Link Planner
Plan which pages should link to each other, with anchor text.
Text & Writing Tools8
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Word Counter
Count words, characters, sentences and paragraphs as you type. -
Case Converter
Switch text between sentence, title, upper, lower and code cases. -
Duplicate Line Remover
Remove repeated lines from a list and optionally sort it. -
Find and Replace Tool
Replace words or patterns throughout a text, with regex support. -
Lorem Ipsum Generator
Generate placeholder text as paragraphs, sentences, words or lists. -
Text Diff Checker
Compare two versions of a text and highlight the differences. -
URL Slug Generator
Convert titles into clean, readable URL slugs. -
Reading Time Calculator
Estimate how long a text takes to read or to speak aloud.
Image & File Tools8
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Image Compressor
Shrink image file sizes with adjustable quality, without uploading. -
Image Resizer
Change an image’s width and height, keeping proportions if you like. -
Image Format Converter
Convert images between JPG, PNG and WebP formats. -
Image Cropper
Crop an image to an exact area or aspect ratio. -
Image Color Picker
Pick exact HEX, RGB and HSL colours from any pixel of an image. -
QR Code Generator
Create QR codes for links, Wi-Fi, contacts and more; download PNG or SVG. -
PDF Merger and Splitter
Combine PDFs into one file, or extract and split pages. -
PDF to Image Converter
Render PDF pages as PNG or JPG images at the resolution you need.
Online Calculators & Converters8
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Percentage Calculator
Solve the five most common percentage questions, with formulas. -
Discount Calculator
Work out sale prices, savings, stacked discounts and tax. -
Profit Margin Calculator
Find margin, markup and the selling price that hits your target. -
Age Calculator
Find an exact age in years, months and days on any date. -
Date Difference Calculator
Count days and working days between dates, or add days to a date. -
Unit Converter
Convert length, weight, temperature, volume, data and more. -
BMI Calculator
Calculate adult body mass index in metric or imperial units. -
Compound Interest Calculator
Project how savings grow with compound interest and deposits.
Developer Tools8
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JSON Formatter and Validator
Pretty-print, minify and validate JSON with exact error locations. -
Base64 Encoder and Decoder
Encode and decode Base64 for text and files, including URL-safe Base64. -
URL Encoder and Decoder
Percent-encode and decode URLs, and inspect their parts. -
Hash Generator
Create MD5 and SHA hashes of text or files and verify checksums. -
UUID Generator
Generate v4 and v7 UUIDs in bulk and inspect existing ones. -
Regex Tester
Test regular expressions with live highlighting and capture groups. -
HTML, CSS and JavaScript Minifier
Shrink HTML, CSS and JavaScript by removing what browsers do not need. -
Password Generator
Generate strong random passwords with cryptographic randomness.
No tools match your search. Check the spelling, try a more general word, or choose “All categories”. If a tool you need is missing, tell us about it.