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MORPH Media Converter

Convert audio, video, and images between 34+ formats using FFmpeg in your browser

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MORPH Media Converter

Table of Contents

  1. Overview
  2. Key Features
  3. How to Use
  4. Frequently Asked Questions
  5. Privacy & Security

Overview

MORPH Media Converter is a universal media conversion tool that transforms audio, video, and image files between 34+ formats entirely within your web browser. Powered by FFmpeg WebAssembly (v0.12.10), the converter loads a ~32MB FFmpeg engine directly into your browser tab, enabling professional-grade media processing without uploading a single byte to any server. Once loaded, the FFmpeg core is cached by your browser for instant availability on future visits.

The converter supports three distinct operational modes. Convert mode handles single-file conversions with granular control over output quality, codec settings, and format-specific parameters. Batch mode lets you queue multiple files and convert them all at once to the same target format, saving significant time when processing large media libraries. Merge mode combines multiple audio or video files into a single output, perfect for joining podcast segments, music tracks, or video clips into one continuous file.

MORPH covers 11 audio formats (MP3, WAV, OGG, FLAC, AAC, M4A, OPUS, AIFF, AC3, AMR, WEBM), 13 video formats (MP4, WEBM, AVI, MKV, MOV, FLV, WMV, OGV, 3GP, TS, M4V, MPG, GIF), and 10 image formats (PNG, JPG, JPEG, WEBP, BMP, GIF, SVG, TIFF, ICO, AVIF). For image conversions, MORPH uses the Canvas API for instant processing without needing FFmpeg at all, making image-to-image conversions nearly instantaneous regardless of file size. For audio and video, you get full control over quality via CRF (Constant Rate Factor) values from 18 to 36, audio bitrate from 64 to 320 kbps, and volume adjustment from 0% to 1000%. The remux mode allows instant format changes when no re-encoding is needed, completing in seconds what would otherwise take minutes.

Key Features

FFmpeg WebAssembly Engine

Powered by FFmpeg compiled to WebAssembly (v0.12.10, ~32MB). Runs the same industry-standard media processing engine used by professionals, directly in your browser. Cached after first load for instant subsequent use.

11 Audio Formats

Convert between MP3, WAV, OGG, FLAC, AAC, M4A, OPUS, AIFF, AC3, AMR, and WEBM audio. From lossy compressed formats to lossless studio-quality audio, every major audio format is supported.

13 Video Formats

Full support for MP4, WEBM, AVI, MKV, MOV, FLV, WMV, OGV, 3GP, TS, M4V, MPG, and animated GIF. Convert legacy formats to modern ones or produce compatible files for any device or platform.

10 Image Formats

Transform images between PNG, JPG, JPEG, WEBP, BMP, GIF, SVG, TIFF, ICO, and AVIF. Image conversions use the Canvas API for near-instant processing without loading FFmpeg.

3 Modes: Convert, Batch, Merge

Convert mode for single files with full settings control. Batch mode to process multiple files to the same format in one operation. Merge mode to combine audio or video files into a single output.

Remux Mode (Instant)

Change container formats without re-encoding for near-instant conversions. When the source codec is compatible with the target container, remux skips the slow encoding step entirely.

Quality Controls (CRF / Bitrate / Volume)

Fine-tune output with CRF quality from 18 (near-lossless) to 36 (high compression), audio bitrate from 64 to 320 kbps, and volume adjustment from 0% to 1000% for normalizing or boosting audio levels.

Canvas API for Images

Image conversions bypass FFmpeg entirely, using the browser's native Canvas API for instant results. Supports image resizing from 0 to 4096 pixels with automatic aspect ratio preservation.

How to Use

  1. Open MORPH Media Converter - Launch the converter in your browser. On first visit, the FFmpeg WebAssembly engine (~32MB) will download and cache. Subsequent visits load instantly from cache. No installation or account is required.
  2. Select Your Media Type - Choose between Audio, Video, or Image using the media type selector at the top. This filters the available input and output formats to only those relevant to your chosen media type.
  3. Upload Your File - Click the upload area or drag and drop your file into the converter. For Batch mode, you can add multiple files at once. For Merge mode, add two or more files in the order you want them combined.
  4. Choose Your Target Format - Select the desired output format from the dropdown menu. Audio offers 11 formats (MP3, WAV, OGG, FLAC, AAC, M4A, OPUS, AIFF, AC3, AMR, WEBM), video offers 13 formats, and images offer 10 formats.
  5. Adjust Quality Settings - For video, set the CRF value (18 for near-lossless, 23 for balanced, 36 for maximum compression). For audio, choose a bitrate between 64 and 320 kbps. Adjust volume from 0% to 1000%. Enable remux mode for instant container-only changes.
  6. Start the Conversion - Click the Convert button to begin processing. A progress indicator shows the conversion status. Audio and video conversions use FFmpeg WASM, while image conversions use the Canvas API for near-instant results.
  7. Download Your Converted File - Once the conversion completes, click the download button to save the output file to your device. In Batch mode, each converted file gets its own download button. All processing happens locally -- nothing is uploaded anywhere.

Frequently Asked Questions

What formats does MORPH support?
MORPH supports 34+ format targets across three media categories. Audio: MP3, WAV, OGG, FLAC, AAC, M4A, OPUS, AIFF, AC3, AMR, and WEBM (11 formats). Video: MP4, WEBM, AVI, MKV, MOV, FLV, WMV, OGV, 3GP, TS, M4V, MPG, and animated GIF (13 formats). Images: PNG, JPG, JPEG, WEBP, BMP, GIF, SVG, TIFF, ICO, and AVIF (10 formats). You can convert between any supported formats within the same media category.
Why does FFmpeg take a while to load the first time?
FFmpeg WebAssembly is a ~32MB file that needs to be downloaded on your first visit. This is because the entire FFmpeg media processing engine is being loaded into your browser -- the same engine used by professional video editors and streaming services. After the initial download, the file is cached by your browser, so subsequent visits load almost instantly. If loading seems stuck, check your internet connection and try refreshing the page.
How do I get the best audio quality?
For the highest audio quality, convert to a lossless format like FLAC or WAV, which preserves all original audio data without any compression artifacts. If you need a compressed format, choose MP3 or AAC at 320 kbps, which is considered transparent quality (indistinguishable from the original for most listeners). For voice recordings and podcasts, 128-192 kbps is typically sufficient. Avoid converting lossy formats to lossless, as this increases file size without improving quality.
What does the CRF setting do for video quality?
CRF (Constant Rate Factor) controls video quality during encoding. Lower values mean higher quality and larger files; higher values mean lower quality and smaller files. CRF 18 is visually near-lossless and produces large files. CRF 23 is the default balanced setting, offering good quality with reasonable file sizes. CRF 28-36 produces progressively smaller files with noticeable quality reduction. For archival purposes, use CRF 18-20. For sharing on social media or messaging apps, CRF 26-30 typically provides acceptable quality at much smaller sizes.
What is the difference between remux and re-encode?
Remux copies the audio and video streams directly from one container format to another without decoding or re-encoding them. This is nearly instant and produces zero quality loss, since the actual media data is not modified -- only the file wrapper changes. For example, remuxing an MKV to MP4 copies the H.264 video and AAC audio streams as-is into an MP4 container. Re-encoding, by contrast, decodes the original streams and encodes them again, which takes more time and can reduce quality. Use remux when you only need to change the container format and the source codecs are compatible with the target container.
How does Batch mode work?
Batch mode lets you add multiple files and convert them all to the same target format in a single operation. Upload your files by dragging and dropping or using the file picker (you can select multiple files at once), choose your desired output format and quality settings, and click Convert. Each file is processed sequentially using the same settings. When complete, each converted file gets its own download button. Batch mode is ideal for converting entire music libraries, photo collections, or video archives to a new format.
How does Merge mode work?
Merge mode combines two or more media files into a single output file. Add your files in the order you want them joined, select the output format, and click Merge. The tool concatenates the files sequentially -- the second file plays right after the first, the third after the second, and so on. This is perfect for joining podcast segments, combining music tracks into a continuous mix, or stitching video clips together. For best results, ensure all input files use the same codec, sample rate (for audio), and resolution (for video).
How does image conversion work differently?
Image conversions use the browser's native Canvas API instead of FFmpeg, which means they are nearly instantaneous regardless of file size. When you convert an image, MORPH draws it onto an HTML5 canvas element and exports it in the target format. This approach also enables image resizing from 0 to 4096 pixels with automatic aspect ratio preservation. Because the Canvas API is built into every modern browser, image conversions work without waiting for FFmpeg to load and require significantly less memory than FFmpeg-based processing.
Are there file size limits?
There is no hard file size limit imposed by MORPH itself, but practical limits depend on your device's available memory. FFmpeg WASM runs inside your browser's memory space, so very large files (typically over 2GB) may cause the browser to run out of memory and crash the tab. For most users, files up to 500MB-1GB work reliably. If you experience issues with large files, try closing other browser tabs to free memory, use a desktop browser rather than mobile, or split large files into smaller segments before converting.
Is my data safe? Are files uploaded anywhere?
Your files are never uploaded to any server. MORPH runs 100% client-side using FFmpeg WebAssembly, which processes your media files directly in your browser's memory. The conversion happens entirely on your device -- no data leaves your machine at any point during the process. There are no server-side APIs, no cloud processing queues, and no temporary file storage. Once you close the browser tab, all file data in memory is released. This makes MORPH ideal for converting sensitive, confidential, or private media files.

Privacy & Security

Your Data Never Leaves Your Device

MORPH Media Converter is built on the zero-data-upload principle. The entire FFmpeg media processing engine runs locally in your browser via WebAssembly -- the same technology that powers desktop video editors, compiled to run safely inside your browser's sandbox. Your audio files, video files, and images are never transmitted to any server. There is no upload step, no cloud processing, and no temporary server storage. All conversion happens in your device's memory, and all data is released when you close the tab. The FFmpeg WASM binary itself is fetched once and cached by your browser, requiring no further network requests during conversion. Whether you are converting a private voice recording, confidential video footage, or sensitive documents, MORPH ensures complete privacy by design.

Ready to convert your media files? MORPH is free, private, and runs entirely in your browser.

Launch MORPH Media Converter →

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Milan Salvi

Milan Salvi

Founder, Leena Software Solutions

Milan is the founder of ZeroDataUpload and Leena Software Solutions, building privacy-first browser tools that process everything client-side. View all articles ยท About the author.

Last Updated: March 26, 2026