Utilities Bunker — explore 887 tools across 19 categories.

01 / 19

Utilities

Test your screen, keyboard, mouse, microphone, speakers, webcam and touchscreen in the browser. Nothing to install, and nothing you test leaves your device.

10 tools Browse all →
02 / 19

Text & Encoding

Encoders, decoders, ciphers, hashing, counters and text converters.

24 tools Browse all →
03 / 19

Numbers & Math

Unit converters, base converters, calculators, and math utilities.

75 tools Browse all →
04 / 19

Media & Files

Image, audio, video tools and file inspection utilities.

96 tools Browse all →
05 / 19

Electronics

Ohm's law, resistor codes, LED calculators, and circuit tools.

192 tools Browse all →
06 / 19

Color & Design

A universal color converter, pickers, palette generators, contrast checkers, and gradient builders.

14 tools Browse all →
07 / 19

Web & Dev

JSON/XML formatters, URL tools, regex testers, and HTTP utilities.

57 tools Browse all →
08 / 19

Code Lab

Learn to program from zero to advanced — pick a language and your level, then step through code, run it live, and work through guided lessons.

9 tools Browse all →
09 / 19

Finance

Loan calculators, interest tools, currency converters, and tax estimators.

77 tools Browse all →
10 / 19

Time & Date

Date, age and work-day calculators, time zones and world clocks, Unix timestamps, hours worked, and timers.

14 tools Browse all →
11 / 19

Science & Engineering

Physics, chemistry, material properties, and engineering calculators.

98 tools Browse all →
12 / 19

Automotive

Torque, horsepower, fuel economy, tire sizing, exhaust flow, intake, injector, and turbo sizing tools.

36 tools Browse all →
13 / 19

Aviation

Weight and balance, fuel burn, airspeed, and flight calculators.

11 tools Browse all →
14 / 19

Construction

Concrete, gravel, brick, drywall, tile, roofing, siding and trim estimators in feet or metres, plus joist spans, beam and snow loads, stairs, drainage and map measuring.

45 tools Browse all →
15 / 19

Health & Fitness

BMI, BMR, calories, macros, body fat, and wellness tools.

55 tools Browse all →
16 / 19

Grades & Education

GPA, final grades, weighted scores, and academic performance tools.

12 tools Browse all →
17 / 19

Networking

IP geolocation, MAC address lookup, DNS, subnet, and other browser-native network tools.

12 tools Browse all →
18 / 19

Number Systems

42 integer-base + numeral-system converters: decimal / binary / octal / hex / Roman / English words / scientific notation.

35 tools Browse all →
19 / 19

Welding

Welding amperage charts, tungsten electrode selection, shielding gas mixtures, filler rod cross-reference, and weld symbol guides.

15 tools Browse all →

Flagship Tools

The ones that do what no other site does
Circuit Inspector DC · AC · faults
Paste a SPICE-style netlist and it runs real nodal analysis — solves every node voltage and branch current, sweeps the frequency response into a Bode plot, names the circuit, flags faults (no ground, floating nodes, unprotected LEDs, no-feedback op-amps) and routes you to the right calculator. Like “File Inspector, but for circuits.”
Inspect a circuit
Math Inspector equations · data · units
Paste any equation, formula, dataset or unit expression and it tells you what kind of math it is, solves it, flags bad math, and routes you to the right tool. Like “File Inspector, but for math.”
Inspect some math
File Inspector 1,734 extensions
Drop in any file and see inside it — true format, structure, embedded metadata, crypto, decompiled code and more, across 1,734 known extensions. Nothing is uploaded; it all runs in your browser.
Inspect a file
Universal Image Converter 322 in · 284 out
Drop any image — 322 input formats, 284 output formats, 91,448 possible conversions. PNG, JPG, WebP, AVIF, HEIC, TIFF, PSD, camera RAW and far beyond, one tool, all client-side. No upload, no watermark, no limits.
Convert an image

New Tools

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EXE Analyzer New
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Aviation
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Signature Generator New
Media & Files
Socket & Wrench Size Converter New
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Metadata Scrubber — Remove Hidden Data from Any File Tool
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Browse by Category

Utilities
Test your screen, keyboard, mouse, microphone, speakers, webcam and touchscreen in the browser. Nothing to install, and nothing you test leaves your device.
Text & Encoding
Encoders, decoders, ciphers, hashing, counters and text converters.
Numbers & Math
Unit converters, base converters, calculators, and math utilities.
Media & Files
Image, audio, video tools and file inspection utilities.
Electronics
Ohm's law, resistor codes, LED calculators, and circuit tools.
Color & Design
A universal color converter, pickers, palette generators, contrast checkers, and gradient builders.
Web & Dev
JSON/XML formatters, URL tools, regex testers, and HTTP utilities.
Code Lab
Learn to program from zero to advanced — pick a language and your level, then step through code, run it live, and work through guided lessons.
Finance
Loan calculators, interest tools, currency converters, and tax estimators.
Time & Date
Date, age and work-day calculators, time zones and world clocks, Unix timestamps, hours worked, and timers.
Science & Engineering
Physics, chemistry, material properties, and engineering calculators.
Automotive
Torque, horsepower, fuel economy, tire sizing, exhaust flow, intake, injector, and turbo sizing tools.
Aviation
Weight and balance, fuel burn, airspeed, and flight calculators.
Construction
Concrete, gravel, brick, drywall, tile, roofing, siding and trim estimators in feet or metres, plus joist spans, beam and snow loads, stairs, drainage and map measuring.
Health & Fitness
BMI, BMR, calories, macros, body fat, and wellness tools.
Grades & Education
GPA, final grades, weighted scores, and academic performance tools.
Networking
IP geolocation, MAC address lookup, DNS, subnet, and other browser-native network tools.
Number Systems
42 integer-base + numeral-system converters: decimal / binary / octal / hex / Roman / English words / scientific notation.
Welding
Welding amperage charts, tungsten electrode selection, shielding gas mixtures, filler rod cross-reference, and weld symbol guides.

Your data stays on your device

Every tool runs entirely in your browser. Nothing is uploaded, stored on servers, or tracked. No accounts. No cookies for analytics. Just tools that work.