All Tools
- free tools running locally in your browser. For a break, try our free browser games. Pick a category or search below.
Oneyfy offers 100+ free online tools that run entirely in your web browser. Whether you need a quick calculation, a text utility, a developer helper, or a way to process an image, you'll find it here — and you can use it immediately, without creating an account, installing software, or uploading your data to a server. Every tool is built to work client-side, meaning the computation happens in your browser tab rather than on a remote server. Results appear instantly, your inputs stay private, and the tools work on any device with a modern web browser.
The tools are organized into 15+ categories covering a broad range of everyday and professional needs. From health calculators that help you understand your body metrics to developer utilities that clean up and validate code, from image processing tools that resize and compress photos to security tools that generate strong passwords and encode data — Oneyfy's free online tools are built to handle real tasks quickly and privately. New tools are added regularly across all categories, so the collection continues to grow.
Calculators cover the most common calculation needs: age calculator, date and time calculators, scientific calculator, matrix calculator, statistics calculator, equation solver, and more. These tools are used by students checking homework, professionals making quick estimates, and anyone who needs a precise calculation without opening a spreadsheet.
Developer Tools are utilities that programmers use daily: JSON formatter and validator, regex tester, JavaScript beautifier and minifier, HTML and CSS formatters, JWT decoder, diff checker, code minifiers, and more. All developer tools process code locally, which is important for security — you can format or inspect sensitive code without it leaving your machine.
Text & Writing Tools help writers, students, and content creators work with text efficiently. The word counter, character counter, case converter, text sorter, duplicate line remover, slug generator, readability checker, and lorem ipsum generator are all here. These tools are useful for blog writers, social media managers, students working within character limits, and developers building content systems.
Image Tools let you process photos and images without uploading them to a cloud service. Compress images, resize them to specific dimensions, crop to a custom area, apply filters and effects, extract the color palette, strip EXIF metadata, or convert between formats — all processed locally in your browser for full privacy.
Health & Fitness Tools provide evidence-based calculators for tracking wellness metrics. BMI calculator, calorie calculator, body fat percentage calculator, BMR calculator, ideal weight calculator, and pace calculator all use established formulas (WHO guidelines, Mifflin-St Jeor equation, etc.) to give you accurate, personalized results.
Local processing matters most when the tools handle sensitive data. The password generator produces strong, random passwords entirely in your browser — no generated password is ever transmitted to Oneyfy's servers. The encryption and hashing tools process your input locally, which means your plaintext is never exposed to a third party. The image tools process your photos in the browser, so personal photos you resize or compress are never uploaded anywhere. Even the resume builder and invoice generator keep your content on your device. This privacy-first approach is a deliberate design decision: the server simply never sees what you are working on.