MP4 vs WebM: Complete Comparison of Video Container Formats
A technical comparison between MP4 and WebM containers: compatibility across Apple, Windows, and Android ecosystems, compression ratios, and which to choose for web publishing or archiving.
Upload a lecture, interview or meeting and get an editable transcript, timed subtitles, or a summary with its key points. Image and document converters sit alongside them, and the guides explain the formats behind each tool.
What you can do here
Speech to text, timed captions and summaries for recordings you already have, plus converters for images and documents. No account and no installed software.
Transform video speech into clean, editable plain text. Upload local MP4/MOV files or paste public links with auto-language detection.
Transcribe voice memos, interviews, and podcasts from MP3, WAV, M4A, FLAC, and OGG files into formatted plain text.
Summarize recordings into four structured formats: executive recap, scannable key points, action items, or Q&A pairs.
Generate auto-timed subtitle cues with AI speech recognition or import existing SRT/VTT files for in-browser timestamp editing.
Extract pristine MP3 (up to 320 kbps), WAV, M4A, FLAC, OGG, or OPUS from any video. Upload long recordings of any duration with zero file size limits.
Cut the background from a photo and save a transparent PNG, or process a batch and download the results as one ZIP.
Convert images between JPG, PNG, WebP, AVIF and GIF in your browser, several files at a time.
Product Overview
MediaDocks turns recordings into things you can read, search and publish. Upload a lecture, an interview or a meeting and you get back an editable transcript, a set of timed subtitle cues, or a summary with its key points and action items.
The problem it solves is that audio and video are terrible formats for finding anything. A two-hour recording holds maybe fifteen minutes you actually need, and the only way to locate them is to sit through it. Transcription converts that into text you can skim in a minute, quote accurately, and search months later.
The image, PDF and audio tools follow the same idea: do the job in your browser or in a request-scoped temporary location, hand the result back, and keep no copy of your media on our servers.
What each tool does is described on its own page.
The AI tools work on files you provide, and you remain responsible for holding the rights to anything you upload or save.
Real-World Workflows
Practical examples of the jobs these tools are built for.
Add subtitles to your own clips so they read well for viewers watching on mute, and pull the audio track out of a recording you made.
Turn a recorded lecture or webinar into a readable transcript, then condense it into key points for revision.
Prepare images for each channel: resize, convert formats, cut out a background, and export clean caption files for video posts.
Transcribe your own interview recordings so you can search them and quote the speaker accurately.
Convert images and PDFs, build QR codes, and extract audio from long video files you already have.
What happens to the files you use with each tool.
Files you send to the server for processing are handled in a temporary location scoped to the request and are not kept as a library or archive.
The image converter, resizer, PDF, SVG, Base64 and QR tools, and the Background Remover, run in your browser, so those files do not need to be uploaded.
There is no sign-up and no password. Anything you do not send to a server stays on your device.
AI transcription accepts uploads up to 100 MB and two hours by default. Each tool page lists its own limits.
Want to review our detailed legal and privacy commitments? Read our Privacy Policy or Terms of Service.
Knowledge Center
Educational documentation on codecs, container formats, audio bitrates, and web video performance.
A technical comparison between MP4 and WebM containers: compatibility across Apple, Windows, and Android ecosystems, compression ratios, and which to choose for web publishing or archiving.
A complete guide to video resolutions: understanding pixel dimensions, aspect ratios, bitrate requirements, and how to choose the right resolution for your device and bandwidth.
Explore the technology behind digital video compression: why H.264 remains universal, how VP9 powers YouTube, why HEVC faced licensing hurdles, and how AV1 shapes the future of streaming.
FAQ
Scope, accuracy, privacy and limits.
Transcribe a recording, add subtitles, convert an image or document, or read a guide first. There is nothing to install and no sign-up step.