Tools tagged "merge"

Combine two mono audio files (MP3 / WAV / M4A / FLAC / OGG) into one stereo file. The first file becomes the left channel, the second becomes the right; we interleave them and output one stereo WAV / MP3. Useful for putting two-mic interview takes into a single L/R file, faking stereo from a mono source, or reversing audio-channel-split. When lengths differ, truncate to the shorter file or pad the shorter one with silence — your choice. Everything stays in your browser.

Concatenate multiple audio files via the ffmpeg.wasm concat demuxer. Reorder by drag. Stream copy keeps codec untouched, but all inputs must share the same codec and sample rate.

Combine multiple images into one — as a grid, a horizontal strip, or a vertical strip. Composited via Canvas entirely in the browser. Tune columns, gap, padding, background color and output format (PNG / JPEG / WebP). Reorder with up/down buttons.

Combine multiple same-size images (JPEG / PNG / WebP) into one PNG by stacking them per-pixel: average for astrophotography noise reduction, median to remove people from a busy scene, maximum (lighten) for star trails or firework composites, minimum (darken) to keep the dark frames. Runs entirely in Canvas + getImageData; your photos never leave your device.

Drag and drop multiple PDFs, reorder them, and merge into a single PDF. Runs entirely in your browser.

Concatenate multiple text files (.txt / .md / .csv / .tsv / .json / .log / .srt / .vtt, etc.) into a single file. Optional filename header before each file, automatic filename sort, manual drag reorder, and a divider line between entries. Perfect for stitching together transcripts, logs, meeting notes, or chapter drafts. Runs entirely in your browser.

Concatenate multiple video files via the ffmpeg.wasm concat demuxer. Reorder by drag. Stream copy keeps the codec untouched, but all inputs must share the same codec / resolution / frame rate (great for stitching segments produced by the video cut tool).