Usage guide

Audio and video compression

Audio accepts MP3, PCM WAV, M4A (AAC) and AAC, saving as MP3 or M4A. Video accepts H.264/AAC MP4, M4V and MOV, saving as MP4; silent H.264 video is also supported. Input limits are 512MB/6 hours for audio and 2GB/2 hours/4K for video, with a 256MB output limit. Actual support depends on browser codecs and device performance.

Changing bitrate, channels, resolution or frame rate can affect quality. Selected bitrates are ceilings, adjusted to the original size; only full results smaller than the original can be saved. Video retains its aspect ratio without upscaling and outputs up to 1080p/30fps. The first-5-seconds sample runs separately from full compression. Only primary video/audio tracks are kept; subtitles and descriptive metadata are excluded. Files are processed in the browser without being sent to a server or OpenAI. Keep originals and check output playback.

Photo conversion scope

ByteCompression adjusts the compression level, pixel dimensions and output format of JPG, PNG and WebP photos. You can add up to 20 photos with a combined size of 150 MB. Each input photo must be no larger than 30 MB, 6,000 px per dimension and 16 million pixels in total. HEIC and preservation of animation are not supported. File sizes use 1 KB = 1,000 bytes.

Check file size and submission requirements

An encoding quality of 80% does not mean an 80% reduction in file size. Actual size depends on the original and output format and may increase. We do not guarantee a particular maximum size, compliance with photo requirements for passports, exams or job applications, or submission approval. Check the output size, dimensions and format, as well as the recipient’s requirements for face position, background and other details.

Quality, cropping and transparency

Compression and resizing can change image quality. “Crop” trims around the center when aspect ratios differ. “Fit with padding” keeps the whole photo and fills the remaining space. Transparent areas and padding are saved as white in JPG, while PNG and WebP preserve transparency.

“Lossless” describes PNG’s encoding compression. It does not mean that content altered by resizing or cropping, or the original metadata, remains unchanged. Original metadata such as camera information and identical color rendering are not guaranteed.

Keep originals and save results

Keep a separate copy of important originals and check the results before using them. The service does not directly overwrite selected original files, but whether a download overwrites an existing file of the same name depends on your browser and save-location settings. “Clear all” removes the list and conversion results, not originals or files already downloaded. Reloading the page resets the work list, so download any results you need first. Supported output formats and download behavior may vary by browser and device.

Rights to use photos

Use photos you took yourself or have permission to edit and use. Do not use the service to violate copyright, likeness rights or privacy rights. Selecting a photo does not give the operator ownership of it or permission to use it for promotion or training.

Errors and contact

If conversion fails, check the stated format and size limits. For questions about the service or your rights, contact makemypicfit@gmail.com. When describing a problem, avoid sending original photos or unnecessary personal information.

This guide explains the scope and use of the features. It does not exclude users’ rights or the operator’s legal obligations under applicable law.

About this site

This site’s code and interface were created with the help of OpenAI Codex. Photo conversion runs in your browser and does not send photos to OpenAI. This service is not operated or officially endorsed by OpenAI.