Guides
Practical file how-tos, no fluff.
Clear, step-by-step guides to the everyday file tasks — cleaning metadata, verifying downloads, fixing subtitles and more — each backed by a free tool that runs entirely in your browser.
How to Remove AI Metadata and C2PA From Images
AI image tools tuck Content Credentials, prompts and seeds into the file. See what is in yours and clear it before you share.
Read guideHow to Remove an AI Watermark From an Image (What Actually Works)
"AI watermark" means three different things. Here is which ones you can remove, which you cannot, and how to clean an AI image honestly.
Read guideHow to Convert a File to Base64
What Base64 is good for, how a data URI differs from plain Base64, why the encoded text grows by a third, and how to decode it back into a working file.
Read guideHow to Create a ZIP File Online
Why a ZIP is easier to send than loose files, what kinds of files actually shrink, and how to bundle everything into one archive without uploading a thing.
Read guideHow to Generate a Dummy Test File
Why you need a file of a known size for testing, the difference between blank and random contents, and how to generate one locally without hunting for a real file.
Read guideHow to Unzip Files Online
How to open a ZIP and browse its contents, extract a single file without unpacking the rest, and why password-protected archives need their original program.
Read guideHow to Batch Rename and Clean Filenames Safely
Why messy filenames break uploads and sync, the cleanup rules that fix them, and how to rename a whole folder at once with a before/after preview.
Read guideCheck Video Codec and Media Info Before You Re-encode
When a video won't play on your TV or phone, the codec is usually why. Learn to read every detail of a media file: container, codec, bitrate, resolution, and audio.
Read guideHow to Find Duplicate Files and Reclaim Space
Spot true duplicates by content, not filename, then free up space without deleting the wrong copy.
Read guideHow to Convert CRLF to LF Line Endings
Understand CRLF, LF, CR, and BOM, spot the symptoms of a line-ending mismatch, and convert text files to one consistent style.
Read guideIdentify an Unknown File Type by Its Real Format
Extensions lie. Learn to read a file's real format from its own contents, and why a mismatch between the name and the true type is a security red flag.
Read guideHow to Make a Favicon From an Image
Why one favicon is no longer enough, how to turn a single square logo into the full icon set, and exactly where the files go plus the HTML to add.
Read guideHow to Remove EXIF Data From Photos
See what your photos are quietly carrying and strip it out before you share, all inside your browser.
Read guideHow to Remove Metadata From Images and PDFs
Author names, GPS coordinates, and edit history hide in your files. Find them and clear them before you send anything out.
Read guideHow to Resync and Edit Subtitles (SRT and VTT)
Fix subtitles that run early or late with a single time shift, edit individual lines, and convert between SRT and VTT formats.
Read guideHow to Split and Rejoin Large Files
Why you split a file, how numbered parts rejoin into a byte-identical original, and the tips that keep all the pieces together when you send them.
Read guideHow to Verify a File Checksum (Step by Step)
Confirm a download matches the publisher's hash so you know it arrived intact and untampered.
Read guideSkip the reading — just use the tools
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