# Merge & Split Tools > Merge or split PDFs, audio and video, stitch and slice images, collages, video grids and panoramas. - URL: https://qilingtools.com/en/tags/split-merge - Price: Free, no sign-up - Privacy: Runs locally in the browser; files are never uploaded ## Tools (25) - [Merge PDF](https://qilingtools.com/en/pdf/merge): Free online PDF merger: combine several PDF files into one in the order you choose, with reordering. Processed locally in your browser, no upload, no sign-up. - [Split / Extract PDF](https://qilingtools.com/en/pdf/split): Free online PDF splitter: extract a page range into a new PDF, or split every page into its own file and download them as a ZIP. Processed locally. - [Stitch Images](https://qilingtools.com/en/image/stitch): Free online image stitcher: join screenshots or photos vertically or horizontally into one long image, with gap and background options. Processed locally. - [Trim Audio](https://qilingtools.com/en/audio/trim): Free online audio trimmer: set start and end times to cut a clip from MP3, WAV, M4A and more. Make ringtones. Processed locally, no upload. - [Merge Audio](https://qilingtools.com/en/audio/merge): Free online audio merger: join MP3, WAV and other audio files in order into one file, mixed formats supported. Processed locally, no upload. - [Split Audio](https://qilingtools.com/en/audio/split): Free online audio splitter: cut long recordings, album rips and audiobooks into parts by count, fixed length or specific time points, downloaded as a zip. - [Mix Audio](https://qilingtools.com/en/audio/mix): Free online audio mixer: play voice, a backing track and background music together, with adjustable levels and a built-in limiter. Processed locally. - [Remove Silence](https://qilingtools.com/en/audio/silence): Free online silence remover: cut the dead air at the start and end of a recording and shorten long pauses in the middle, with an adjustable threshold. - [Trim Video](https://qilingtools.com/en/video/trim): Free online video trimmer: set start and end times to cut a clip; fast mode finishes in seconds without re-encoding. Processed locally, no upload. - [Merge Videos](https://qilingtools.com/en/video/merge): Free online video joiner: combine several MP4, MOV or MKV clips into one file, even when their resolution and frame rate differ. Processed locally. - [Split Image into Grid](https://qilingtools.com/en/image/grid): Free online image grid splitter: cut a picture into a 3×3 grid for Instagram, or 2×2, 1×3, 2×3 and more. Tiles are numbered in order and zipped. Runs locally. - [Photo Collage](https://qilingtools.com/en/image/collage): Free online collage maker: arrange several photos into one grid image with adjustable columns, cell shape, spacing and background. Drag to reorder. - [Split Long Image](https://qilingtools.com/en/image/split): Free online long image splitter: cut long screenshots and posters by piece count, fixed height or phone screen ratio, numbered in order and zipped. - [Organize PDF Pages](https://qilingtools.com/en/pdf/organize): Free online PDF page organizer: every page as a thumbnail — drag to reorder, rotate or delete single pages, then export a new PDF. Runs locally. - [Multiple Pages per Sheet](https://qilingtools.com/en/pdf/n-up): Free online PDF N-up tool: lay 2, 4, 6 or 9 pages onto one sheet with a choice of A4 orientation, margins and gaps to save paper. Runs locally, never uploaded. - [Insert Pages into PDF](https://qilingtools.com/en/pdf/insert): Free online tool to insert pages into a PDF: add blank pages, images or pages from another PDF at the start, the end or around page N, or interleave two scans. - [Split Screen Video](https://qilingtools.com/en/video/stack): Free online split-screen video maker: place 2–4 videos side by side, stacked or in a 2×2 grid, with size and frame-rate matching, gap and audio mix. - [Video Splitter](https://qilingtools.com/en/video/split): Free online video splitter: split into equal parts, every X seconds, by MB per part or at timeline markers. Fast lossless or frame-accurate mode, ZIP download. - [Advanced PDF Splitter](https://qilingtools.com/en/pdf/split-advanced): Split a PDF by bookmarks, maximum file size, every N pages, odd/even pages, blank separator pages or a keyword/regex. Preview the parts, download a ZIP. - [Merge Scanned Fronts & Backs](https://qilingtools.com/en/pdf/interleave): Combine a fronts PDF and a backs PDF from a single-sided scanner into correct duplex order, with reversed backs, 180° rotation, blank padding and preview. - [Panorama Stitcher](https://qilingtools.com/en/image/panorama): Stitch 2–10 overlapping photos into a panorama: automatic order and alignment, cylindrical projection, exposure compensation, seamless blending, auto-crop. - [Split PDF Spreads](https://qilingtools.com/en/pdf/split-spread): Split book-spread scans into single pages: left/right or top/bottom, auto gutter detection with per-page tweaks, right-to-left order, no recompression. - [Video Scene Detection](https://qilingtools.com/en/video/scene-detect): Detect shot and scene changes in a video online: adjustable threshold, scene thumbnails, contact sheet, CSV and EDL cut lists, YouTube chapters, scene clips. - [Split PDF by Separator Sheets](https://qilingtools.com/en/pdf/split-qr): Split a batch-scanned PDF at QR or barcode separator sheets, blank pages or marker text; keep or drop separators, name files from QR, print sheets. - [Split / Join Files](https://qilingtools.com/en/split-file): Free online file splitter: cut a big file into .001 .002 parts by size or count to fit an attachment limit, and join the parts back together. Runs locally.