Download Accelerator

Download accelerator with parallel connections per file and concurrent downloads

Download Accelerator speeds up your downloads by splitting files into multiple parts and fetching them simultaneously over parallel connections — similar to IDM or JDownloader, built right into Chrome. KEY FEATURES • Parallel connections — split each file into up to 16 simultaneous connections per download • Multiple concurrent downloads — run several downloads at the same time • Pause & resume — stop and continue any download without losing progress • Real-time progress — per-connection speed lanes, live transfer speed and ETA • Right-click download — "Download with Download Accelerator" on any link • Intercept mode — optionally capture all browser downloads automatically • Custom download folder — choose where files are saved TWO MODES Browser Mode works out of the box — no installation required. Downloads are handled directly in the browser using parallel Range requests. Native Mode (optional) unlocks the full potential: a small native helper app opens true parallel TCP connections over HTTP/1.1, bypassing Chrome's HTTP/2 multiplexing for maximum speed. Supports authenticated downloads by forwarding session cookies. Install it once with a single script on macOS or Windows. OPEN SOURCE Full source code available on GitHub: https://github.com/zettifour/download-accelerator PRIVACY No data is collected, stored remotely, or shared. All settings are saved locally on your device only. VERSION 1.2.3 • Adds a persistent rotating Windows Native Host log with download progress, retry, and failure diagnostics. • Retries transient network and byte-range failures with fresh connections on Windows and macOS. • Reports technical failures clearly and keeps .part files for diagnosis, while explicit cancellation still removes them. • Prevents intermittent Windows file-lock failures by keeping the output file open throughout parallel writes. • Makes macOS Pause reliably stop active transfers and resume interrupted ranges without consuming retry attempts. • Keeps the official Chrome Web Store ID permitted while supporting a separate developer extension ID.