Format, indent and beautify JSON.
Runs in your browserDeveloper
87 practical tools in one place
Free online calculators, converters and developer tools
Pick a tool and get the job done. No account required. Every page clearly shows whether processing happens in your browser or on our server.
86 run locally No account required Ready to use
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Popular conversions
Frequently checked pairs with a ready-to-use converter, exact formula and value table.
Quick reference
Reference tables and cheat sheets
Find a code, character, or color and get straight to the value you need.
- ASCII table All 128 seven-bit ASCII codes with decimal, hexadecimal, binary, character, and control-code notation. 128 codes →
- HTTP status codes Searchable HTTP response status reference grouped into informational, success, redirection, client-error, and server-error classes. 64 status codes →
- CSS named colors Search all standardized CSS named colors and copy their HEX or RGB values. 148 color names →
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Popular tools
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Convert a date and time between any two time zones.
Runs in your browserTime & date -
Convert between about 250 units of measurement, offline in your browser.
Runs in your browserConverters -
See the current local time in cities and time zones around the world.
Runs in your browserTime & date -
Convert text to Base64 and back.
Runs in your browserDeveloper -
Calculate sunrise, sunset, twilight and solar noon for a place and date.
Runs in your browserTime & date
Where the work happens
How each tool runs
86 of these tools run entirely in your browser.
1 run on our server. Input and output are automatically deleted within one hour.
Read the privacy policy 86 browser-only tools
1h maximum retention