Folders
Meet Folders: one free app for 382 kinds of files
Folders is a free, open-source file manager for Android, Windows and Linux that opens PDFs, Office files, 3D models, code, videos and archives itself, with no ads and no account.
Android
12 guides on this topic.
How to clean junk files on Android without deleting anything you need
Free up storage by clearing thumbnail caches, leftovers and other junk, with a cleaner that only ticks what's certainly safe to delete and shows you everything else first.
How to find and remove duplicate files safely
Duplicate photos, videos and downloads waste gigabytes. Find true copies by their contents, not their names, keep the oldest of each and delete the rest, on Android, Windows or Linux.
How to free RAM on Android 14 and newer, now that apps can't close other apps
Since Android 14, RAM cleaner apps can't close background apps any more. Here's why, when freeing memory actually helps, and how Folders' Extreme mode still does it, safely.
How to move files between your phone and PC over Wi-Fi, without a cable
Two free ways to send photos, videos and documents between Android and a computer on the same Wi-Fi: a browser link with a QR code, or Nearby share that works with LocalSend.
How to open HEIC photos and convert them to JPG, on Android and Windows
HEIC photos from iPhones won't open everywhere. View them on Android and convert one or a whole batch to JPG, PNG, WebP or AVIF, for free, keeping the originals.
How to open Markdown and code files on Android, with preview and highlighting
Read README.md files as formatted pages, view Python, JavaScript, Kotlin and 127 more code types with syntax highlighting, and edit and save them, in a free file manager.
How to open RAR, 7z and ZIP files on your phone
Open ZIP, RAR, 7z, TAR, GZ and ISO files on Android or a PC, look inside without extracting, open a single file, or extract everything, for free and without ads.
How to open STL, OBJ and 3MF files on Android (no CAD app needed)
Open STL, OBJ, 3MF, GLB, FBX and 24 other 3D model formats on your Android phone: spin, zoom, check the mesh and see the triangle count, for free.
How to play MKV videos with subtitles, and find subtitles online for free
Play MKV, MP4, AVI and other videos with embedded or external subtitles, search subtitles online without an account, and fix their timing, size and colour.
Read and edit PDF, Word and Excel files offline, without an office suite
Open PDF, DOCX, XLSX and PPTX files on Android, Windows or Linux: search, sign PDFs, add notes, edit Word text and spreadsheet cells, present slides, all offline and free.
Where WhatsApp, Telegram and Instagram keep your files, and how to find them
Find WhatsApp images, videos, documents and statuses, Telegram downloads and Instagram saves on Android: the exact folders, and one place that gathers the files you need most.