All Free Tools
8,451 free online tools across 85 categories
Every tool here runs in your browser — no sign-up, no upload, nothing to install. Convert files, format code, generate text, run calculations, and check SEO across PDF, image, developer, finance, and unit-conversion tools. Pick one and start.
| Tool | Category | Description | Action |
|---|---|---|---|
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HTTP Status Code Lookup
|
Developer Tools | Open | |
|
HTTP Status Code Reference
|
Developer Tools | Open | |
|
Hubble Law Calculator
|
Physics Tools | Open | |
|
Hubble Time Calculator
|
Astrophysics Tools | Open | |
|
HUF to EUR Converter
|
Currency Converters | Open | |
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HUF to GBP Converter
|
Currency Converters | Open | |
|
HUF to USD Converter
|
Currency Converters | Open | |
|
Huffman Coding Tool
|
Developer Tools | Open | |
|
Hull Speed Calculator
|
Engineering Tools | Open | |
|
Human Life Value Calculator
|
Insurance Tools | Open | |
|
Human-Readable to Epoch Converter
|
Developer Tools | Open | |
|
Hunt and Hess Score Calculator
|
Health & Fitness | Open | |
|
Hunt-Hess Subarachnoid Hemorrhage Scale
|
Health & Fitness | Open | |
|
HVAC Cooling Load Calculator
|
Engineering Tools | Open | |
|
HVAC Heating Load Calculator
|
Engineering Tools | Open | |
|
HVAC Load Calculator
|
Construction Tools | Open | |
|
HWB to CMYK Converter
|
Color Tools | Open | |
|
HWB to HEX Converter
|
Color Tools | Open | |
|
HWB to HSL Color Converter
|
Color Tools | Open | |
|
HWB to HSV Color Converter
|
Color Tools | Open | |
|
HWB to LAB Converter
|
Color Tools | Open | |
|
HWB to RGB Converter
|
Color Tools | Open | |
|
HWB to RGBA Converter
|
Color Tools | Open | |
|
HWB to XYZ Converter
|
Color Tools | Open | |
|
Hybridization Finder
|
Chemistry Tools | Open | |
|
Hydration for Skin Calculator
|
Beauty Tools | Open | |
|
Hydraulic Cylinder Calculator
|
Construction Tools | Open | |
|
Hydraulic Cylinder Force Calculator
|
Engineering Tools | Open | |
|
Hydraulic Demand Fire Sprinkler Calculator
|
Engineering Tools | Open | |
|
Hydrogen Electron Configuration
|
Chemistry Tools | Open | |
|
Hydrogen Element Properties
|
Chemistry Tools | Open | |
|
Hydrogen Energy Level Calculator
|
Physics Tools | Open | |
|
Hydrogen Oxidation States
|
Chemistry Tools | Open | |
|
Hydrometer Temperature Correction Calculator
|
Food & Cooking | Open | |
|
Hydropower Output Calculator
|
Energy Tools | Open | |
|
Hydrostatic Pressure Calculator
|
Physics Tools | Open | |
|
Hydrostatic Pressure Well Calculator
|
Engineering Tools | Open | |
|
Hyperbola Properties Calculator
|
Math Calculators | Open | |
|
Hyperbolic Cosine Calculator
|
Math Calculators | Open | |
|
Hyperbolic Sine Calculator
|
Math Calculators | Open | |
|
Hyperbolic Tangent Calculator
|
Math Calculators | Open | |
|
Hyperfocal Distance Calculator
|
Number Tools | Open | |
|
Hypergeometric Distribution Calculator
|
Math Calculators | Open | |
|
IBU Bitterness Calculator
|
Food & Cooking | Open | |
|
ICH Score Calculator
|
Health & Fitness | Open | |
|
ICH Volume ABC/2 Calculator
|
Health & Fitness | Open | |
|
ICO to AVIF Converter
|
Image Tools | Open | |
|
ICO to BMP Converter
|
Image Tools | Open |
Showing 3,457–3,504 of 8,451 tools