Most file sharing services block certain file types — usually executables that could contain malware. Here’s exactly what you can and can’t upload, and why those restrictions exist.
PDF, DOC, DOCX, XLS, XLSX, PPT, PPTX, ODT, ODS, ODP, RTF, TXT, CSV, MD — all document formats are allowed.
JPG, JPEG, PNG, GIF, SVG, WEBP, AVIF, BMP, TIFF, RAW, HEIC, HEIF — every image format works.
MP4, MOV, AVI, MKV, WEBM, WMV, FLV, 3GP — any video up to 250MB.
MP3, WAV, FLAC, AAC, OGG, WMA, M4A, AIFF — all audio formats supported.
ZIP, RAR, 7Z, TAR, GZ, BZ2, XZ — compress anything into an archive.
HTML, CSS, JS, JSON, XML, YAML, PY, RB, GO, RS, JAVA, C, CPP, H — code files are just text files.
Fonts (TTF, OTF, WOFF2), ebooks (EPUB, MOBI), design files (PSD, AI, SKETCH, FIG), 3D models (OBJ, STL, GLB), databases (SQLITE, DB).
For security, fff files blocks executable formats that could contain malware:
Executable files can run code on someone’s computer. Even a seemingly harmless EXE ("invoice.pdf.exe") can install malware. Blocking them protects recipients from accidentally running dangerous files.
If you need to share an executable: zip it first. The ZIP format preserves the file while preventing accidental execution. Most services — including fff files — allow executables inside password-protected archives.
How long your file stays online depends on its size: