Many online utilities upload your file to a server, process it there, and send the result back. That takes transfer time and gives another system access to your photos, recordings, or videos. Xian's Tools processes tool inputs directly in your browser.

Why files do not need to be uploaded

The media tools use established open-source software compiled to WebAssembly, a format that lets programs run inside a browser:

• Image tools use ImageMagick for compression, conversion, resizing, and inspection; the image cropper uses browser image rendering.

Video and audio tools use FFmpeg for media processing.

Encryption and encoding tools use JavaScript libraries to calculate results on the page.

When you open a tool, your browser downloads the processing code. When you select a file, the tool reads it locally and creates the result for download in the browser.

Benefits

• Local processing: selected ID photos, screenshots, and recordings are not uploaded for conversion.
• No upload delay: large media files do not need to be transferred to a processing server first.
• No installation: use the tools from a web page without installing an editor or plugin.
• Free to use, without registration.

Practical limits

• Device performance matters: long, high-resolution videos can take time to process on your CPU.
• Browser memory is limited: very large files may fail. Try a smaller source file or a desktop media editor when necessary.
• Initial loading takes time: video and audio tools need to download the FFmpeg core before their first conversion.

A desktop browser is preferable, especially for precise timeline and crop adjustments. Browser codec support can affect whether a file can be previewed or read.

Image tools

• Image Compression: adjust quality, reduce JPG or PNG size, and compare the output ratio.
• Image Format Converter: convert source images such as PNG, JPG, and BMP to JPG or PNG.
• Image Cropper: use ratios such as 1:1 or 16:9, rotate or flip, and export PNG, JPG, or WebP.
• Image Tools: resize, inspect image information, and create ICO icons.

Video tools

• Video Compression: reduce target bitrate and estimate output size.
• Video Format Converter: select MP4, MKV, AVI, MOV, WebM, FLV, or M4V output.
• Video Clip: trim a segment, crop the frame, and export MP4.

Audio tools

• Audio Compression (https://laoxianlaoxian.com/en/audio/compression)：目标使用更低比特率，以获得更小的录音和音乐文件。
• Audio Format Converter (https://laoxianlaoxian.com/en/audio/convert)：选择 MP3、WAV、FLAC、M4A、OGG、WMA 或 AC3 输出。
• Audio Clip (https://laoxianlaoxian.com/en/audio/clip)：使用波形选择片段，并导出 MP3 音频剪辑。

QR code tools

• QR Code Encoder (https://laoxianlaoxian.com/en/more/qrcode-encode)：在您输入时根据文本或 URL 生成二维码。
• QR Code Decoder (https://laoxianlaoxian.com/en/more/qrcode-decode)：选择一张二维码图片，并在本地读取其内容。

Encryption and encoding tools

[Extract Audio from Video](https://laoxianlaoxian.com/en/video/extract-audio): export a video's audio as MP3, WAV, or another supported format.

• AES Encryption and Decryption (https://laoxianlaoxian.com/en/more/aes)：AES-128、AES-192 或 AES-256，支持 CBC 或 ECB，以及 hex 或 Base64 编码。
• AES Passphrase Encryption (https://laoxianlaoxian.com/en/more/aes-with-key)：CryptoJS 兼容的口令工作流。
• MD5 Calculator (https://laoxianlaoxian.com/en/more/md5)

Combining tools

• Share a phone video under a size limit: keep the useful part with Video Clip, then try Video Compression at quality 50 and check the actual size.
• Prepare a website image: crop to 16:9, resize to 1200 pixels wide, then compress as JPG.
• Create a favicon: crop to 1:1, then resize and export ICO at 256 × 256.

Listen to a lesson during your commute: extract its audio as MP3, then use Audio Compression if further size reduction is needed.

Report an issue or suggest a tool through Feedback. Find more guidance on the Help page.