# 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 10 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 - [avatar creator seo](https://schools.app/blog/avatar-creator-seo) - [brain breaks for the classroom seo](https://schools.app/blog/brain-breaks-for-the-classroom-seo) - [brain games for seniors seo](https://schools.app/blog/brain-games-for-seniors-seo) - [case converter seo](https://schools.app/blog/case-converter-seo) - [convert international grades to gpa seo](https://schools.app/blog/convert-international-grades-to-gpa-seo) - [crop image seo](https://schools.app/blog/crop-image-seo) - [do brain training games work seo](https://schools.app/blog/do-brain-training-games-work-seo) - [extract text from pdf seo](https://schools.app/blog/extract-text-from-pdf-seo) - [final grade calculator seo](https://schools.app/blog/final-grade-calculator-seo) - [five minute brain workout seo](https://schools.app/blog/five-minute-brain-workout-seo) - [gpa calculator seo](https://schools.app/blog/gpa-calculator-seo) - [grade calculator seo](https://schools.app/blog/grade-calculator-seo) - [heic to jpg seo](https://schools.app/blog/heic-to-jpg-seo) - [how grade weighting works seo](https://schools.app/blog/how-grade-weighting-works-seo) - [how grading works seo](https://schools.app/blog/how-grading-works-seo) - [how many topics to study to pass seo](https://schools.app/blog/how-many-topics-to-study-to-pass-seo) - [how to choose a brain training app seo](https://schools.app/blog/how-to-choose-a-brain-training-app-seo) - [how to curve grades seo](https://schools.app/blog/how-to-curve-grades-seo) - [how to improve concentration in children seo](https://schools.app/blog/how-to-improve-concentration-in-children-seo) - [how to improve focus while studying seo](https://schools.app/blog/how-to-improve-focus-while-studying-seo) - [how to improve processing speed seo](https://schools.app/blog/how-to-improve-processing-speed-seo) - [how to improve working memory seo](https://schools.app/blog/how-to-improve-working-memory-seo) - [how to raise your gpa seo](https://schools.app/blog/how-to-raise-your-gpa-seo) - [how to study for exams seo](https://schools.app/blog/how-to-study-for-exams-seo) - [image compressor seo](https://schools.app/blog/image-compressor-seo) - [image converter seo](https://schools.app/blog/image-converter-seo) - [image resizer seo](https://schools.app/blog/image-resizer-seo) - [image to pdf seo](https://schools.app/blog/image-to-pdf-seo) - [memory games for adults seo](https://schools.app/blog/memory-games-for-adults-seo) - [memory techniques seo](https://schools.app/blog/memory-techniques-seo) - [mental math tricks seo](https://schools.app/blog/mental-math-tricks-seo) - [pdf compressor seo](https://schools.app/blog/pdf-compressor-seo) - [pdf merger seo](https://schools.app/blog/pdf-merger-seo) - [pdf to jpg seo](https://schools.app/blog/pdf-to-jpg-seo) - [percentage to letter grade seo](https://schools.app/blog/percentage-to-letter-grade-seo) - [qr generator seo](https://schools.app/blog/qr-generator-seo) - [qzbrain brain training seo](https://schools.app/blog/qzbrain-brain-training-seo) - [readability checker seo](https://schools.app/blog/readability-checker-seo) - [remove exif data seo](https://schools.app/blog/remove-exif-data-seo) - [rotate pdf seo](https://schools.app/blog/rotate-pdf-seo) - [split pdf seo](https://schools.app/blog/split-pdf-seo) - [standards based grading explained seo](https://schools.app/blog/standards-based-grading-explained-seo) - [text compare seo](https://schools.app/blog/text-compare-seo) - [watermark pdf seo](https://schools.app/blog/watermark-pdf-seo) - [weighted vs unweighted gpa seo](https://schools.app/blog/weighted-vs-unweighted-gpa-seo) - [what is a good gpa seo](https://schools.app/blog/what-is-a-good-gpa-seo) - [what is cognitive training seo](https://schools.app/blog/what-is-cognitive-training-seo) - [what is number sense seo](https://schools.app/blog/what-is-number-sense-seo) - [word counter seo](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.