Online tools for websites, front-end development, and SEO
Tools for people who build websites: CSS generators,
converters, markup checkers, and text utilities. Everything opens instantly and runs
in your browser — no registration or file uploads to a server.
32 tools6 categories
Search by name
Search by name or by task: “shadow”, “тень”, “quotation marks”, “base64”.
For example:
shadow
color
password
Total 32 tools
A tool does something with data: generates, converts, checks,
and formats. If you need to calculate a number — payback, margin, or tax — see calculators .
7
Everything that helps search engines read a site correctly.
Builds rules for search crawlers and checks them for errors.
Open
Creates a sitemap from a list of URLs, with priorities and dates.
Open
Shows the full path from the URL to the final page and the response codes.
Open
Builds a page's heading tree and finds missing levels.
Open
Writes the title and description and instantly shows how they appear in search results.
Open
Builds a tagged URL and keeps your campaign list close at hand.
Open
Checks language versions and finds one-way links.
Open
6
Generators that output a ready-to-use piece of styling.
Builds shadows layer by layer and outputs ready-to-use CSS.
Open
Builds a linear, radial, or conic gradient.
Open
Converts sizes between units at any base font size.
Open
Calculates clamp() for a font size or spacing value between two viewport widths.
Open
Draw a grid with your mouse and get grid-template.
Open
Fine-tune blur, contrast, and other filters on your own image.
Open
promo Blog archive Twenty years of notes on websites and advertising. Open
6
Color, contrast, and images — no editor installation required.
Calculates the contrast of a color pair and shows whether it passes AA and AAA.
Open
Converts colors between formats, including modern ones.
Open
Builds a shade scale from a single color—from 50 to 950.
Open
Extracts the main colors from an uploaded image.
Open
Cuts an image into every size and writes the embed code.
Open
Reduces the file size of JPEG, PNG, and WebP—the file is never uploaded.
Open
4
Cleans up text before publication.
Transliterates Cyrillic into Latin characters according to URL rules.
Open
Counts characters, words, and reading time, with limits for title and description.
Open
Adds guillemets, dashes, and nonbreaking spaces.
Open
Shows line by line what was added and removed.
Open
8
Things people Google every day instead of keeping them at hand.
Pretty-prints JSON and shows where the error is.
Open
Encodes and decodes text and files.
Open
Encodes and decodes URLs and parameters.
Open
Calculates MD5, SHA-1, SHA-256, and SHA-512 hashes for a string or file.
Open
Creates passwords of the required length and assesses how difficult they are to crack.
Open
Explains a cron expression in Russian and shows the next runs.
Open
Highlights matches and groups as you type.
Open
Converts Unix time to a date and back, taking the time zone into account.
Open
1
Small things that keep the day organized.
Browser-based todo list: no account, everything is stored on your device.
No results for “
Search checks both names and synonyms: “shadow” finds box-shadow, and so does “тень”. Since nothing matched, the query is probably too long — try one word instead of two.
Show all 32 tools
shadow
color
password
If you need to calculate a number—payback, margin, or tax—see the adjacent catalog: 12 calculators .
You can calculate payback, margin, or tax in the adjacent section.
All 12 calculators