• English

      • Changelog

      Upcoming features: add AI polishing for translated subtitles.

      • 2026.06.11: New LiteLLM self-hosted gateway; API Relay fully user-controlled with self-hosted relay support.
        • New LiteLLM provider: one self-hosted OpenAI-compatible proxy fronting 100+ upstream models, with its own config slot (no need to occupy Custom). The URL is the credential (default 127.0.0.1:4000), API Key optional (master key); the model field can stay empty when the proxy is started with litellm --model — it follows the server default
        • Tencent Hunyuan works in browsers again: the official endpoint currently rejects CORS preflights (direct calls always fail), so it now routes through API Relay by default and works out of the box; the switch stays available to flip back to direct once Tencent fixes it
        • API Relay fully user-controlled: YandexGPT moved from forced relay to "on by default, can be turned off"; all 12 relay-capable providers now accept a self-hosted relay address — the precedence is fixed at custom URL > relay switch > official direct, and the switch grays out with a note while a URL is filled in
        • The relay now passes through the server's Retry-After header — rate-limit auto-slowdown through the relay is exactly as precise as direct calls
        • Fix: CORS failures on Firefox / Safari now show the actionable "enable API Relay" hint too (previously only Chrome's error wording was recognized, burning 3 useless retries); all relay-related hints are localized into the 18 UI languages
      • 2026.06.10: Free machine translation overhaul — GTX gateway migration + new Edge (Free) + concurrency fix.
        • GTX migrated to a new gateway: the old translate.googleapis.com/translate_a endpoint was tightened by Google's anti-abuse (many IPs redirected to a captcha page, reported as CORS in the browser). It now uses the gateway behind Google's web-translate widget, translate-pa.googleapis.com — CORS-correct with better availability. The old endpoint stays as a Legacy gtx fallback; you can also paste a self-hosted mirror URL (protocol auto-detected from the address shape)
        • New Edge API (Free): Microsoft Edge's built-in translator backend (Azure engine) — zero-config and free, on a completely different route from GTX, so if one can't connect you switch to the other. Free machine translation now has three options: GTX / Edge / DeepLX
        • GTX concurrency fix: now translates in batched chunks (~5000 chars/block, one request per block), cutting request volume sharply versus line-by-line so everyday use rarely hits rate limits; the projection-style progress preview stays live in chunked mode
        • Fix: removed TranslateGemma's redundant /models health check — some LM Studio builds don't route that endpoint, causing "Test connection works but actual translation is blocked"; it now takes the exact same request path as the Test button
      • 2026.06.10: Adaptive rate limiting + fully localized error hints.
        • Adaptive 429 slowdown: when any service gets rate-limited, all of its requests pause and resume automatically (honoring the server's Retry-After, otherwise 1s→60s exponential backoff, with jittered resume to avoid a second burst), with a "Rate limited — pausing briefly" notice. GTX Free keeps its fast default concurrency — full speed normally, automatic duty-cycling under throttling
        • Fully localized error hints: HTTP status codes (invalid key, insufficient balance, model not found, unsupported parameter, rate limit, quota exhausted, server errors — 11 classes) now map to actionable hints in all 18 UI languages; the failure panel, tool error toasts, and Test buttons uniformly show "raw reason + hint"; network errors and timeouts get localized copy instead of raw "Failed to fetch"
        • Test Connection timeout now follows the "Request timeout" setting (was a fixed 30s): slow local thinking models no longer fail the test while translating fine; test timeouts are classified separately
        • Fix: TranslateGemma's preflight check now normalizes URLs the same way the translation service does — bare LAN addresses (e.g. http://192.168.x.x:1234) no longer "pass the test but get blocked when translating"
      • 2026.06.10: New Glossary feature.
        • Pin fixed translations for names and domain terms, applied per target language; multiple presets (one per show / project), TSV bulk import/export (optional third column for a target language code — one file imports terms for several languages), editor with search / duplicate warnings / pagination
        • Multi-layer enforcement: LLMs get only the terms hit by the current text injected per request (no token waste); Qwen-MT uses the official native translation_options.terms parameter; lines that ignore a required term are retried once with a stricter instruction; a post-hoc replacement net guarantees terms land on every service
        • Coverage: all LLM services + Qwen-MT; plain MT APIs (GTX / Google / DeepL / Azure / TranslateGemma) have no in-model term channel, so the glossary card is hidden there
        • New glossary status chip next to the API status badge showing on/off state and term count — click to jump to settings
      • 2026.06.09: Stability and accessibility hardening.
        • An adversarial-review hardening pass across the translation engine and the subtitle / Markdown / JSON / text tool groups: placeholder and code-fence protection, format edge cases, and explicit errors for invalid paths / regexes instead of silent no-ops
        • Subtitle alignment fix: when batch markers go missing, lines are no longer guessed by position — no more shifted translations
        • Accessibility: skip-to-content link and navigation landmarks added; all tool controls are now keyboard-operable
      • 2026.06.06: Added YandexGPT (AI Studio).
        • New LLM provider YandexGPT (AI Studio): authenticates with API key + Folder ID; ships YandexGPT 5.1 / Alice AI / Qwen3 / DeepSeek / GPT-OSS SKUs, or paste a full gpt:// model URI; the official API sends no CORS headers, so requests route through the built-in proxy
        • TranslateGemma gains an optional API key for gated deployments (LM Studio's "require API key", vLLM's --api-key, or a reverse-proxy auth layer)
      • 2026.06.01: Added GitHub Models; thinking-control overhaul.
        • New LLM provider GitHub Models: authenticates with a GitHub PAT (models:read scope), with a free tier tiered per model (GPT-4.1 / 4.1 Mini / 4o Mini, Mistral Medium 3, Phi-4, Llama 3.3 70B) — a good no-cost entry point for users without a paid key. The gateway doesn't support reasoning params, so no thinking toggle is shown.
        • Thinking-control overhaul: Mistral (Medium 3.5 / Small 4) and Cohere Command A Reasoning move from always-on to an off / on toggle; Perplexity Sonar Deep Research gains off / low / medium / high.
        • Custom (unlisted) models on a thinking-capable provider get a new three-state off / on / auto control: off explicitly disables, on enables, auto omits the param to follow the model's default (a fallback for strict providers that error on non-thinking models); defaults to off.
        • Fix: provider selection guard is now purely derived, so a stale bundle no longer silently overrides the user's choice.
      • 2026.05.26: Translation engine deep-tuning.
        • New opt-in maxTokens cap for Custom (OpenAI-compatible) to prevent local small-model repetition loops; finish_reason=length truncation detection added to Claude / Gemini / OpenAI-compat
        • Default contextWindow for Custom local LLM lowered from 100 to 30 to match the behavior of models under 14B
        • Failure handling: failed lines now auto-fill with original text (output always usable); whole-language failures in multi-language mode aggregate into a dedicated panel with one-click copy-target-language for retry
        • SRT / VTT bilingual mode adds an ASS output option with separate Default / Secondary styles for original and translation — independent font/color/size tweaks in any subtitle editor
        • Friendly error messages for NetworkError / timeout / cascaded abort — no more raw "Failed to fetch"
        • Thinking mode toggle now stored per model; UI auto-distinguishes three-level (off/low/med/high) / binary (off/on) / low-high-only effort variants; intrinsic-thinking SKUs no longer show a useless toggle
        • Language picker overhaul: 122 languages grouped by geography + speaker count; multi-language mode adds Top 10 / Europe / East Asia / Indian Subcontinent presets; single-language mode remembers the last 5 picks; mobile collapses to a single column
        • DeepLX moved below DeepL in the service dropdown (brand-grouped, stable version first)
      • 2026.05.06: Service catalog v2 — major release.
        • New MT service: TranslateGemma (Google's translation-specialized Gemma derivative, self-hosted)
        • New LLM providers: MiniMax, Tencent Hunyuan, Baidu ERNIE (Qianfan), Cohere
        • Quick-pick regional endpoints across providers (Mainland CN / International / US, etc.)
        • Thinking mode + reasoning effort (low / medium / high) for DeepSeek, NVIDIA NIM, Claude, etc.
        • New "skip system message" toggle for Custom (OpenAI-compatible), compatible with Gemma chat templates
        • URL field auto-completes /v1/chat/completions on blur — guards against misusing Responses / legacy completions
        • Standalone Prompt preset management (decoupled from LLM API presets, freely combinable)
        • Main page now shows an API Status badge plus a one-click source/target language swap
        • Fixed: cache writes were happening even when caching was disabled; LLM-backed MT (Qwen-MT, TranslateGemma) retry behavior now aligns with LLM
      • 2025.07.29: Added context-aware translation for AI mode.
      • 2025.03.20: Completed i18n (internationalization); fixed known bugs including cache key issues; project open-sourced.
      • 2025.02.28: Added support for custom system and user prompts for LLM model translations.
      • 2025.02.27: Enhanced timeline compatibility for bilingual subtitles, supporting formats that omit the default hour, exceed 100 hours, and display 1 to 3 millisecond digits.
      • 2025.02.21: Added support for batch translating into multiple languages at once.
      • 2025.02.08: Fixed encoding detection issue in multi-file mode; added interfaces for OpenAI and Groq (feedback for other interfaces is welcome).
      • 2025.02.06: Added Siliconflow API; added temperature setting for LLM models to control AI translation randomness.
      • 2025.02.05: Fixed an issue where blank lines and DeepLX line breaks were ignored during chunked translation; added separate chunk translation parameters for different APIs.
      • 2025.01.18: Added support for automatic encoding detection for uploaded files; added an option to display translated content above or below the original subtitle line.
      • 2025.01.13: Added a self-hosted DeepLX interface; refactored translation API settings into a separate component to simplify frontend logic.
      • 2025.01.10: Added DeepSeek translation interface. Fixed DeepLX subtitle line break issue; improved translation language search and detection (added support for searching in Chinese/English).
      • 2024.12.19: Added automatic detection for single-file vs. multi-file mode; added automatic source language detection; improved file export naming convention for single-file translations.
      • 2024.12.12: Used p-limit to restrict concurrency, significantly reducing errors with free APIs.
      • 2024.10.12: Added a custom delay setting for the GTX API. (Based on feedback, the previous setting could easily hit the limit after 150 requests, while lower numbers didn't require adjustment).
      • 2024.09.08: Added batch translation limits for the GTX API to ensure stability. Added support for Traditional Chinese.
      • 2024.09.07: Improved recognition of WebVTT format; set .ass as the default format for bilingual subtitles and added compatibility for multi-line bilingual processing.
      • 2024.09.06: Added local caching for translation results to speed up the translation of repeated content.
      • 2024.09.05: Added functionality to skip purely numeric or character-based content to avoid unnecessary translations.
      • 2024.08.13: Added bilingual subtitle output feature.
      • 2024.07.11: Added automatic subtitle format matching in single-file mode.
      • 2024.07.06: Added support for .vtt and .ass subtitle formats.
      • 2024.07.05: Expanded supported languages for subtitle translation to 35.
      • 2024.06.26: Added a feature to extract only the subtitle content.