Convert anything —
free, private, unlimited.
Images and audio never leave your browser — conversion is 100% on-device. Documents handled server-side and deleted instantly. No account, no watermarks, no waiting.
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The converters people reach for every day.
Why BoltConverter
Privacy-first conversion, no account required.
Images & audio: 100% in-browser
HEIC, PNG, WebP, MP3, WAV — these convert entirely using WebAssembly in your browser. Zero bytes leave your device. No upload, no server, no privacy risk.
Documents: deleted instantly
PDFs and Word files are processed on our server using a sandboxed converter. Your file is deleted from memory as soon as the download link is generated. We store nothing.
Truly unlimited & free
No account, no rate limit, no file-size cap on client-side conversions. Convert as many files as you need, as often as you want, forever.
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500+ converters across every format category.
Documents
PDF, Word, Excel, PowerPoint
Images
HEIC, PNG, WebP, SVG, AVIF
Audio
MP3, WAV, M4A, AAC, FLAC
Video
MP4, MOV, MKV, WebM, GIF
Units
Length, weight, temperature, volume
Developer Tools
JSON, XML, Base64, CSV, hex