Use the tool below
Encode and decode Base64 text, files, and images. Free Base64 encoder/decoder for APIs, data URLs, and debugging.
What happens when you run Base64 Encoder/Decoder
Paste or upload input into the widget above. Parsing runs for this Base64 encoder decoder session, then you copy or download the transformed result. Nothing is published to a browseable directory of other users’ jobs.
How to use Base64 Encoder/Decoder
1. Paste text or upload a small file
2. Choose Encode or Decode
3. Process
4. Copy result to clipboard
2. Choose Encode or Decode
3. Process
4. Copy result to clipboard
Binary vs Text Modes
Base64 expands size by ~33%. Decoding must use the same character set (standard vs URL-safe). Padding ‘=’ characters matter for strict parsers. Data URIs for images are Base64 under the hood—size limits still apply to emails and CSS.
When NOT to Use Base64
Transport large binaries with binary multipart uploads or temporary file links instead of stuffing megabytes into JSON fields.
Input/output contracts
- Inputs: see tool options
- Outputs: see tool options
- Transport: HTTPS uploads
- Retention: temporary (~2 hours)—not permanent cloud storage
How Base64 Encoder/Decoder differs from typical alternatives
Compared with Base64 encoders such as Base64Encode.org: Standalone Base64 sites handle paste-only workflows without documenting strict auto-deletion when you upload sensitive files. Big File Sharing focuses on free one-off jobs, no mandatory signup, and short-lived temporary files instead of account-centric project history.
Frequently asked questions about Base64 Encoder/Decoder
Is Base64 Encoder/Decoder free to use?
Yes. Base64 Encoder/Decoder is free with no paywalled export on this page. We fund operations with display advertising—not by selling upload contents.
What exactly can Base64 Encoder/Decoder process?
Inputs: formats listed in the widget. Outputs: formats listed in the widget. Base64 expands size by ~33%. Decoding must use the same character set (standard vs URL-safe). Padding ‘=’ characters matter for strict parsers. Data URIs for images are Base64 under the hood—size limits still apply to emails and CSS.
How long are files from Base64 Encoder/Decoder kept?
Tool uploads and results are temporary and automatically removed after about 2 hours. Download anything you need before then; we do not offer permanent archives on this path.
Do I need an account for this Base64 encoder decoder?
No account is required for standard use of this tool. Open the page, run the job, download the result.
When should I use Base64 Encoder/Decoder instead of desktop software?
Use Base64 Encoder/Decoder for quick, one-off Base64 encoder decoder tasks on machines where installs are blocked or overkill. Prefer desktop/CLI tools for bulk automation, strict offline compliance, or multi-hour encoding jobs.
Privacy note: Transfers use HTTPS. Files for tools are temporary (~2 hours) and are not listed in a public gallery. Details: Privacy Policy.