Any file up to 500 MB. Drop several files and they come back as one ZIP. Many image, audio and video conversions run in your browser; anything else is uploaded and removed within the hour.
Convert your compressed MP3 audio files into the lossless FLAC format with our online tool. This is ideal for users who need to integrate older MP3 recordings into high-fidelity audio workflows.
MP3 is a lossy media container that achieves small file sizes by discarding audio data deemed less audible to the human ear. In contrast, FLAC is a lossless media container that preserves the original audio stream perfectly. When converting from MP3 to FLAC, the file acts as a wrapper for the existing compressed data, resulting in a larger file size without adding any missing information back into the audio stream.
Converting MP3 to FLAC does not improve audio quality. Since the original MP3 data was already lossy, the FLAC file will simply contain that same lossy audio in a larger, lossless-compatible container.
We built this project so anyone can convert files without paywalls, accounts, or hidden limits. Here is what that promise means in practice.
Every converter on ConvertX is free to use: no trials, no premium tiers, and no credit packs. We will never put core conversion features behind a subscription. Whether you convert one photo or a hundred files a week, the price stays zero.
Many image, audio, and video conversions run entirely in your browser. Your files never leave your device for those jobs. When server processing is required for documents or specialized formats, uploads are handled securely and removed automatically — typically within one hour.
A quick guide to strengths and trade-offs of popular formats — so you pick the right one before converting.
Music, podcasts, voice recordings, and sound effects.
Common extensions: MP3, WAV, FLAC, OGG, AAC, M4A, OPUS
Raster and vector graphics for web, print, and photography.
Common extensions: PNG, JPG, WebP, AVIF, GIF, SVG, HEIC, TIFF
Office files, PDFs, ebooks, and plain text.
Common extensions: PDF, DOCX, XLSX, PPTX, ODT, EPUB, TXT
Clips, streams, screen recordings, and movies.
Common extensions: MP4, WebM, MOV, MKV, AVI, MPEG
