# schools.app — Free Online Tools for Students & Teachers

> Privacy-first, in-browser utilities for students and teachers. Every tool runs 100% in your browser — files are never uploaded to a server. Free, no account, available in 26 languages.

## Tools
### PDF tools
- [PDF Merger](https://schools.app/pdf-merger/): Combine multiple PDF files into a single document quickly and easily.
- [Split PDF](https://schools.app/split-pdf/): Extract, delete, reorder and split pages from a PDF — entirely in your browser.
- [Image to PDF](https://schools.app/image-to-pdf/): Convert JPG, PNG, or WebP images into a single PDF document. Easily adjust page size, margins, and rotation.
- [Rotate PDF](https://schools.app/rotate-pdf/): Rotate pages in a PDF and download the corrected file. Private and free.
- [PDF Compressor](https://schools.app/pdf-compressor/): Reduce the file size of your PDF documents completely offline.
- [PDF to JPG](https://schools.app/pdf-to-jpg/): Convert every PDF page into a downloadable JPG, PNG, or WebP image, 100% in your browser with no upload.
- [Watermark PDF](https://schools.app/watermark-pdf/): Stamp text or an image watermark across every page of a PDF, free and private, entirely in your browser.
- [Extract PDF Text](https://schools.app/extract-text-from-pdf/): Pull all selectable text out of a PDF into plain text you can copy or download, with nothing leaving your device.

### Image tools
- [Image Resizer](https://schools.app/image-resizer/): Resize images by pixels or percentage to fit upload limits — no upload required.
- [Image Compressor](https://schools.app/image-compressor/): Compress JPG, PNG and WebP images to a target size, right in your browser.
- [Image Converter](https://schools.app/image-converter/): Convert images between PNG, JPG and WebP locally, with transparency handling.
- [Avatar Creator](https://schools.app/avatar-creator/): Upload a photo, crop it into a circle or square, and download it instantly. Everything happens securely in your browser.
- [HEIC to JPG](https://schools.app/heic-to-jpg/): Convert iPhone HEIC photos to JPG or PNG that any school portal, printer, or app accepts, fully in your browser.
- [Crop Image](https://schools.app/crop-image/): Crop photos to exact ID and passport sizes or social and aspect-ratio presets at full resolution, with no upload.
- [Remove EXIF](https://schools.app/remove-exif-data/): See the hidden camera and GPS data in a photo and strip it before sharing, protecting your location and privacy.

### Text tools
- [Word Counter](https://schools.app/word-counter/): Analyze word counts, estimate reading times, and view keyword density instantly.
- [Case Converter](https://schools.app/case-converter/): Change text case and clean up messy text instantly — nothing leaves your device.
- [Readability](https://schools.app/readability-checker/): Check Flesch Reading Ease and Flesch-Kincaid grade level so your writing matches the reading level you want.
- [Text Compare](https://schools.app/text-compare/): Paste two texts and instantly see added, removed, and changed lines highlighted side by side.

### Study tools
- [GPA Calculator](https://schools.app/gpa-calculator/): Calculate your semester GPA instantly. Add courses, grades, and credits to see your results.
- [QR Code](https://schools.app/qr-generator/): Create a high-quality QR code from any link or text instantly. Download and share easily.
- [Grade Calculator](https://schools.app/grade-calculator/): Work out your current course grade from weighted assignments, exams, and categories in seconds.
- [Final Grade](https://schools.app/final-grade-calculator/): Find the exact score you need on your final exam to reach your target course grade.
- [Exam Odds](https://schools.app/exam-probability-calculator/): Studying only some topics? Work out the real odds that at least one topic you studied is drawn in the exam — the hypergeometric calculator used for Spanish oposiciones.

## Guides
- [How to Make a Profile Avatar From Any Photo (Free, In Your Browser)](https://schools.app/blog/avatar-creator-seo)
- [Brain Breaks for the Classroom: 20 Quick Activities to Reset Focus](https://schools.app/blog/brain-breaks-for-the-classroom-seo)
- [Brain Games for Seniors: Enjoyable Ways to Stay Mentally Active](https://schools.app/blog/brain-games-for-seniors-seo)
- [Case Converter: Change Text Case and Clean Up Messy Text Instantly](https://schools.app/blog/case-converter-seo)
- [How to Compress a PDF to Under 5 MB for Upload](https://schools.app/blog/compress-a-pdf-to-under-5mb-for-upload-seo)
- [How to Convert International Grades to a US GPA: A Country-by-Country Guide](https://schools.app/blog/convert-international-grades-to-gpa-seo)
- [Crop a Photo to the Exact Size You Need — Free, Private, No Upload](https://schools.app/blog/crop-image-seo)
- [Do Brain-Training Games Actually Work? What the Science Really Says](https://schools.app/blog/do-brain-training-games-work-seo)
- [How to Extract Text From a PDF in Your Browser (Free, Private, No Upload)](https://schools.app/blog/extract-text-from-pdf-seo)
- [Final Grade Calculator: What Score Do I Need on My Final Exam?](https://schools.app/blog/final-grade-calculator-seo)
- [The 5-Minute Brain Workout: A Simple Daily Routine for a Sharper Mind](https://schools.app/blog/five-minute-brain-workout-seo)
- [How to Calculate Semester GPA with Credits and Letter Grades](https://schools.app/blog/gpa-calculator-seo)
- [Grade Calculator: Work Out Your Current Course Grade in Seconds](https://schools.app/blog/grade-calculator-seo)
- [HEIC to JPG: Convert iPhone Photos for Any School Portal](https://schools.app/blog/heic-to-jpg-seo)
- [How Grade Weighting Works: Why Your Final Counts More Than Your Homework](https://schools.app/blog/how-grade-weighting-works-seo)
- [How Grading Works: A Complete Guide to Grades, GPA & Grading Systems](https://schools.app/blog/how-grading-works-seo)
- [How Long Is a 500-Word Essay? Pages, Paragraphs, and a Writing Plan](https://schools.app/blog/how-long-is-a-500-word-essay-seo)
- [How Many Topics to Study for an Exam? Study Smart with Exam Probability](https://schools.app/blog/how-many-topics-to-study-to-pass-seo)
- [How to Choose a Brain-Training App (and Whether They're Worth It)](https://schools.app/blog/how-to-choose-a-brain-training-app-seo)
- [How to Convert PDF Pages to JPG or PNG Images](https://schools.app/blog/how-to-convert-a-pdf-to-images-seo)
- [How to Curve Grades Fairly: 5 Methods for Teachers (with Examples)](https://schools.app/blog/how-to-curve-grades-seo)
- [How to Improve Concentration in Children: A Parent's Guide](https://schools.app/blog/how-to-improve-concentration-in-children-seo)
- [How to Improve Focus While Studying: 11 Tactics That Work](https://schools.app/blog/how-to-improve-focus-while-studying-seo)
- [Processing Speed: What It Is and How to Improve It](https://schools.app/blog/how-to-improve-processing-speed-seo)
- [How to Improve Working Memory: 10 Exercises That Actually Help](https://schools.app/blog/how-to-improve-working-memory-seo)
- [How to Raise Your GPA: A Realistic Semester Plan](https://schools.app/blog/how-to-raise-your-gpa-seo)
- [How to Study for Exams: A Smart, Science-Backed Routine](https://schools.app/blog/how-to-study-for-exams-seo)
- [Image Compressor: Shrink JPG, PNG and WebP Files in Your Browser](https://schools.app/blog/image-compressor-seo)
- [Image Converter: Change PNG, JPG and WebP in Your Browser](https://schools.app/blog/image-converter-seo)
- [Image Resizer: Resize Photos to Any Size in Your Browser](https://schools.app/blog/image-resizer-seo)
- [How to Turn Photos and Screenshots into a Readable PDF](https://schools.app/blog/image-to-pdf-seo)
- [Memory Games for Adults: Fun Ways to Keep Your Mind Sharp](https://schools.app/blog/memory-games-for-adults-seo)
- [Memory Techniques: The Memory Palace, Mnemonics, and More](https://schools.app/blog/memory-techniques-seo)
- [Mental Math Tricks: How to Calculate Faster in Your Head](https://schools.app/blog/mental-math-tricks-seo)
- [How to Compress a PDF for Free Without Uploading It Anywhere](https://schools.app/blog/pdf-compressor-seo)
- [How to Merge PDFs into a Clear, Complete Submission](https://schools.app/blog/pdf-merger-seo)
- [How to Convert PDF to JPG (or PNG and WebP) Free in Your Browser](https://schools.app/blog/pdf-to-jpg-seo)
- [Percentage to Letter Grade: The Real Conversion Chart (and Why Cutoffs Differ)](https://schools.app/blog/percentage-to-letter-grade-seo)
- [How to Make a QR Code for Classroom Links and Printed Handouts](https://schools.app/blog/qr-generator-seo)
- [QZBrain: Free Memory & Math Brain-Training Games for a Sharper Mind](https://schools.app/blog/qzbrain-brain-training-seo)
- [Readability Checker: Match Your Writing to the Right Reading Level](https://schools.app/blog/readability-checker-seo)
- [How to Reduce Image File Size for Upload Without Losing Useful Detail](https://schools.app/blog/reduce-image-file-size-for-upload-seo)
- [How to Remove EXIF & GPS Data From Photos Before You Share](https://schools.app/blog/remove-exif-data-seo)
- [How to Rotate a PDF Online for Free (and Keep It Private)](https://schools.app/blog/rotate-pdf-seo)
- [How to Split a PDF Online for Free (Without Uploading Anything)](https://schools.app/blog/split-pdf-seo)
- [Standards-Based Grading Explained: A Practical Guide for Teachers](https://schools.app/blog/standards-based-grading-explained-seo)
- [Text Compare: Spot the Differences Between Two Texts Instantly](https://schools.app/blog/text-compare-seo)
- [How to Watermark a PDF Free, Online, and 100% Privately](https://schools.app/blog/watermark-pdf-seo)
- [Weighted vs Unweighted GPA: What's the Difference and Which Do Colleges Use?](https://schools.app/blog/weighted-vs-unweighted-gpa-seo)
- [What Is a Good GPA? High School and College Benchmarks Explained](https://schools.app/blog/what-is-a-good-gpa-seo)
- [What Is Cognitive Training? A Plain-English Guide](https://schools.app/blog/what-is-cognitive-training-seo)
- [What Is Number Sense? And How to Build It at Any Age](https://schools.app/blog/what-is-number-sense-seo)
- [Why Won't My iPhone Photo Upload? Check Format, Size, and Availability](https://schools.app/blog/why-wont-my-iphone-photo-upload-seo)
- [How to Use a Word Counter for Essays, Speeches, and Short Forms](https://schools.app/blog/word-counter-seo)

## About
schools.app is a focused suite of fast, private utilities covering PDFs, images, text and study workflows. All processing happens locally on your device.