- Words and fonts
- A letter can contain up to 4,000 characters. The editor offers six handwriting-style fonts.
- Photos
- Premium supports up to four gallery photos plus a separate keepsake photo. JPEG, PNG and WebP are accepted, up to 5 MiB each.
- Video
- A Premium letter can include one MP4, WebM or MOV video up to 50 MiB. All attachments together can total up to 96 MiB per published letter.
- Music & your voice
- A Premium letter can include one music track and one voice message, up to 20 MiB per file. Supported formats are MP3, WAV, M4A, OGG, FLAC, AAC and WebM audio. Browser recording stops at five minutes. Optional music generation requires sign-in and an available configured provider.
- Account storage
- Profile shows how much space your published letter attachments use against a 1 GB reference. Uploads follow the file and per-letter limits above.