Every tool you need. Nothing you don't.
A growing library of fast, focused web utilities — free to use, no account required, and built to stay out of your way.
Start typing to search…
At a glance
1900+
Tools available
100%
Free to use
No
Account needed
Instant results
Most tools run in your browser for speed and privacy.
Private by default
Your inputs stay on your device, we don't store them.
Trusted by developers & creators worldwide
Numbers that speak for themselves
Fast, focused utilities built for real workflows — no fluff, no sign-ups, no limits.
100K+
Monthly users
Developers, designers, and creators rely on our tools every month.
256K+
Monthly tool executions
Calculations and conversions run directly in your browser — fast and private.
1900+
Free tools
A growing library covering text, code, math, images, and more.
0
Data stored
Everything runs client-side. Your inputs never leave your browser.
Fresh additions
Recently Added
The latest tools added to our collection
Revised Geneva Score Calculator
Calculate the Revised Geneva Score and Simplified Geneva Score to assess clinical pre-test probability of pulmonary embolism (PE).
REM Sleep Calculator
Calculate your REM sleep phases, 90-minute sleep cycles, optimal bedtimes, and wake-up times to feel refreshed and recall dreams.
Relative Fat Mass Calculator
Calculate body fat percentage using the Relative Fat Mass (RFM) formula from height and waist circumference.
Revised Cardiac Risk Index Calculator
Calculate the Revised Cardiac Risk Index (RCRI / Lee's Index) to estimate perioperative cardiac risk in non-cardiac surgery.
RBC Indices Calculator
Calculate red blood cell indices including MCV, MCH, MCHC, and Mentzer index to evaluate anemia and hematologic disorders.
Rate Pressure Product Calculator
Calculate Rate Pressure Product (RPP / Double Product) to assess myocardial oxygen demand and cardiovascular workload at rest or during exercise.
QUICKI Calculator
Calculate the Quantitative Insulin Sensitivity Check Index (QUICKI) and assess insulin resistance from fasting glucose and insulin levels.
QTc Calculator
Calculate corrected QT interval (QTc) using Bazett, Fridericia, Framingham, and Hodges formulas with ECG arrhythmia risk interpretation.
qSOFA Score Calculator
Calculate the quick Sequential Organ Failure Assessment (qSOFA) score to screen adult patients with suspected infection for sepsis risk and in-hospital mortality.
Qp/Qs Ratio Calculator
Calculate the pulmonary-to-systemic flow ratio (Qp/Qs) and shunt fraction from oximetry or echocardiographic Doppler measurements to evaluate intracardiac shunts.
Pulmonary Vascular Resistance Calculator
Calculate pulmonary vascular resistance (PVR), transpulmonary pressure gradient (TPG), and PVR index (PVRI) in Wood units and dyn·s/cm⁵.
Pneumonia Severity Index Calculator
Calculate the Pneumonia Severity Index (PSI / PORT score) to estimate 30-day mortality risk and determine inpatient vs outpatient admission for community-acquired pneumonia.
PSA Doubling Time Calculator
Calculate Prostate-Specific Antigen Doubling Time (PSADT) and PSA velocity from sequential PSA blood tests to evaluate prostate cancer progression.
PSA Density Calculator
Calculate Prostate-Specific Antigen Density (PSAD) from total serum PSA and prostate volume (or ultrasound/MRI dimensions) to assess prostate cancer risk.
Protein Creatinine Ratio Calculator
Calculate urine protein-to-creatinine ratio (UPCR), estimated 24-hour protein excretion, and KDIGO proteinuria risk stage from a spot urine sample.
Prescription Refill Calculator
Calculate days supply of medication, last dose date, and next prescription refill date for tablets and liquid doses.
Ponderal Index Calculator
Calculate your Ponderal Index (Corpulence / Rohrer's Index) and compare it with BMI for adults, children, and neonates.
Pokemon GO Weight Loss Calculator
Calculate calories burned, weekly and monthly fat loss, walking distance, and egg hatch equivalents while playing Pokemon GO.
Plasma Volume Calculator
Calculate estimated plasma volume (ePV), ideal plasma volume (IPV), relative plasma volume status (ePVS), and Strauss delta PV based on weight, height, sex, and hematocrit.
Plasma Osmolality Calculator
Calculate estimated plasma and serum osmolality, effective osmolality (tonicity), and osmolar gap using sodium, glucose, BUN, and ethanol.
Progesterone to Estrogen Ratio Calculator
Calculate the progesterone to estradiol (Pg/E2) ratio to assess hormonal balance and detect estrogen dominance with automatic unit conversions.
PERC Calculator
Assess pulmonary embolism risk in low-prevalence clinical settings using the 8-point PERC rule-out criteria.
Peptide Dosage Calculator
Calculate peptide reconstitution concentration, required injection dose volume, syringe tick marks (U-100, U-50, U-30), and total doses per vial.
Pediatric Blood Transfusion Calculator
Calculate pediatric blood component transfusion volumes for PRBC, platelets, FFP, and cryoprecipitate based on patient weight and target hemoglobin.
Explore the library
Browse by Category
44 categories — pick one to explore its tools
Agriculture & Horticulture
39 tools
ASCII Tools
26 tools
Audio & Video Tools
28 tools
Biology
19 tools
Color Tools
43 tools
Construction & Real Estate
164 tools
Data Conversion
86 tools
Developer Tools
279 tools
Education Tools
17 tools
Electrical & Electronics
35 tools
Encoding & Encryption
80 tools
Engineering Fluid Mechanics
55 tools
Environment Sustainability
37 tools
Finance Calculators
493 tools
Food Cooking
33 tools
Fractal Generators
45 tools
Gaming Tools
32 tools
Health & Fitness
106 tools
Image Manipulation
131 tools
Lifestyle Entertainment
25 tools
List Tools
46 tools
Manufacturing & Machining
23 tools
Math Calculators
401 tools
Miscellaneous tools
554 tools
Name Generators
10 tools
Network Tools
25 tools
Numerology & Esoteric
18 tools
Paycheck Calculators
70 tools
PDF & Document Tools
3 tools
Physics & Chemistry
170 tools
QR & Barcode Tools
6 tools
Random Generators
59 tools
Real Estate Finance
50 tools
Social Media Tools
25 tools
Statistics & Data Analysis
59 tools
Text Editors & Viewers
6 tools
Text Processing
101 tools
Time & Date
158 tools
Travel & Automotive
49 tools
Unicode Tools
43 tools
Unit Converters
178 tools
Utilities
45 tools
Weather & Environment
6 tools
Web & SEO Tools
23 tools
No categories match your search.
On the roadmap
Coming Soon
New mini-tools we're building next.
Html to Jsx
Convert HTML file to JSX online
Instagram Reel Downloader
Download and save Instagram videos locally with our Instagram Reel Downloader. No signup required.
Instagram Reel Thumbnail Downloader
Save thumbnails from any reel
Always free
No subscriptions, credits, or paywalls. Every tool on the site is free to use.
Privacy first
Processing happens client-side whenever possible. Your data never leaves your browser.
Organized by category
Browse by topic or search instantly. Find the right utility in seconds.
From the blog
Latest Blog Posts
Tips, guides, and insights from our team
How to Download a Website Favicon (Free Online Method)
Download any website's favicon in PNG or ICO format. Step-by-step guide for developers and designers using a free favicon downloader.
JWT Token Decoding Explained: How to Read JWT Payloads Safely
Learn how JWT tokens work, what header and payload contain, and how to decode JWT online without exposing secrets. Free JWT decoder guide.
How to Take a Screenshot in Your Browser (Free Tool Guide)
Capture full pages or visible areas in your browser without extensions. Step-by-step guide to our free online screenshot tool.
Stock Splits Explained: What They Are, How They Work, and How to Calculate New Shares
Understand forward and reverse stock splits, how to calculate new shares, cost basis adjustments, and why companies split stock. Free split calculator included.
Support
Frequently Asked Questions
Straight answers about how Online Mini Tools works.
Are the tools on this website free to use?
Do I need to create an account to use the tools?
Can I suggest new tools or features?
Are the results generated by these tools accurate?
Are my inputs and results private and secure?
Are these tools compatible with mobile devices?
Have an idea?
Didn't find the tool you need?
We're always expanding the collection. Tell us what would make your workflow easier and we'll consider it for the roadmap.
Browser Extension
Get the Online Mini Tools Browser Extensions
Search and launch any tool from your browser toolbar — available for Chrome and Firefox. Access 1900+ tools without leaving your current tab.
