# Solvin Tools Free browser-first tools for developers, app publishers, and designers. The site includes JSON formatting, config conversion, JWT decoding, URL parsing, app store screenshot generation, Google Play feature graphics, image conversion, compression, resizing, Base64 encoding, QR codes, color palettes, screenshot annotation, and sequence image composition. ## Canonical URLs - Site: https://www.solvin-apps.com/tools/ - Sitemap: https://www.solvin-apps.com/sitemap.xml - Robots: https://www.solvin-apps.com/robots.txt - Tool catalog JSON: https://www.solvin-apps.com/tools.json ## PackListly - Editable, printable packing lists and a travel packing list generator are integrated at the main Solvin apps domain. - Site: https://www.solvin-apps.com/pack-listly/ - LLM summary: https://www.solvin-apps.com/pack-listly/llms.txt ## Languages - English: https://www.solvin-apps.com/tools/ - 简体中文: https://www.solvin-apps.com/tools/zh-cn/ ## Support And Policy Pages - English Privacy Policy: https://www.solvin-apps.com/tools/privacy/ - English Terms of Use: https://www.solvin-apps.com/tools/terms/ - English Support: https://www.solvin-apps.com/tools/support/ - 简体中文 隐私政策: https://www.solvin-apps.com/tools/zh-cn/privacy/ - 简体中文 使用条款: https://www.solvin-apps.com/tools/zh-cn/terms/ - 简体中文 支持: https://www.solvin-apps.com/tools/zh-cn/support/ ## English Tools - UrgeKit: Use UrgeKit to start a quick Craving SOS, track triggers, review off-plan moments, build a 7-day reset plan, and save habit data locally in your browser. URL: https://www.solvin-apps.com/tools/urgekit/ - Text Reflower: Clean text copied from PDFs, web pages, or documents by merging broken lines, trimming whitespace, and improving mixed-language spacing. URL: https://www.solvin-apps.com/tools/text-reflower/ - JSON Formatter: Format, minify, and validate JSON online for debugging APIs, inspecting payloads, and organizing configuration files. URL: https://www.solvin-apps.com/tools/json/ - Config Converter: Convert JSON, YAML, TOML, and ENV configuration files online. Paste config content, parse it locally in the browser, and export clean output for another toolchain. URL: https://www.solvin-apps.com/tools/config-converter/ - JWT Decoder: Decode JWT header and payload online, inspect expiry and common claims, and generate a local SHA-256 fingerprint for opaque API tokens. URL: https://www.solvin-apps.com/tools/jwt-decoder/ - URL Parser: Parse URLs online, inspect protocol, host, path, hash, encoded query parameters, and compare two URLs to find added, removed, or changed query params. URL: https://www.solvin-apps.com/tools/url-parser/ - Text Codec Toolkit: Encode, decode, escape, and hash text online in your browser. Convert URL components, Base64, Base64URL, HTML entities, JSON strings, Unicode escapes, UTF-8 hex, binary bytes, and SHA digests locally. URL: https://www.solvin-apps.com/tools/codec-toolkit/ - XML Toolkit: Format XML, minify XML, validate XML structure, and convert XML to JSON locally in the browser for feeds, sitemaps, config files, and API payloads. URL: https://www.solvin-apps.com/tools/xml-toolkit/ - CSV Toolkit: Convert CSV to JSON, JSON to CSV, clean and sort CSV rows, export Markdown tables, and generate SQL INSERT statements locally in the browser. URL: https://www.solvin-apps.com/tools/csv-toolkit/ - sub2api CRS JSON Converter: Convert Claude account export JSON between sub2api and Claude Relay Service formats locally in the browser. Paste accounts JSON, map token fields, preserve metadata, and copy the converted backup. URL: https://www.solvin-apps.com/tools/sub2api-crs-converter/ - Developer Toolkit: Use practical developer tools online for regex testing, cron explanation, timestamp conversion, UUID and password generation, SHA hash and HMAC calculation, text diff, JSON Schema inference, CSV to JSON conversion, and SQL INSERT generation locally in the browser. URL: https://www.solvin-apps.com/tools/developer-toolkit/ - SEO Toolkit: Generate SEO metadata, Open Graph tags, robots.txt rules, sitemap.xml files, canonical and hreflang tags, JSON-LD schema, UTM campaign links, and cleaned keyword lists locally in the browser. URL: https://www.solvin-apps.com/tools/seo-toolkit/ - Word Counter: Count words, characters, sentences, paragraphs, reading time, speaking time, keyword density, repeated terms, SEO title length, and meta description length locally in the browser. URL: https://www.solvin-apps.com/tools/word-counter/ - Social Preview Checker: Preview how a page title, description, image, and URL can look in Google-style snippets, X cards, Facebook cards, and LinkedIn shares, then copy Open Graph and Twitter meta tags. URL: https://www.solvin-apps.com/tools/social-preview/ - Schema Markup Generator: Generate valid JSON-LD schema markup for FAQPage, HowTo, Article, Product, SoftwareApplication, BreadcrumbList, and LocalBusiness pages locally in the browser. URL: https://www.solvin-apps.com/tools/schema-generator/ - Keyword Trends Ranker: Rank keywords from Google Trends CSV exports, related queries, and manual keyword tables. Score interest, growth, breakout terms, opportunity, and difficulty locally in the browser. URL: https://www.solvin-apps.com/tools/keyword-trends-ranker/ - App Resource Cropper: Upload an app icon and automatically crop the required iOS, Android, and app store asset sizes. URL: https://www.solvin-apps.com/tools/app-resource-cropper/ - PDF Tools Matrix: Use free PDF tools online to merge PDF files, split or extract pages, organize and rotate pages, add watermarks, signatures, and page numbers, clean metadata, flatten forms, compare PDF text, extract copyable text, convert PDF pages to PNG, convert HTML to PDF, resize pages, and convert PNG or JPG images to PDF locally in the browser. URL: https://www.solvin-apps.com/tools/pdf-tools/ - Markdown to PDF: Convert Markdown to PDF online with table-friendly print styling. Render GitHub Flavored Markdown tables with borders, repeated headers, wrapped cells, landscape mode, and local browser processing. URL: https://www.solvin-apps.com/tools/markdown-to-pdf/ - Markdown Utilities: Edit and preview Markdown online, format Markdown tables, convert CSV or TSV to Markdown tables, convert HTML to Markdown, render Mermaid diagrams to SVG, generate Markdown slides, build a GitHub-style table of contents, and export Markdown as HTML or PDF locally in the browser. URL: https://www.solvin-apps.com/tools/markdown-utilities/ - Favicon & PWA Icon Generator: Generate favicon.ico, PNG favicons, Apple touch icons, Android Chrome icons, maskable PWA icons, and a web manifest from one uploaded logo or app icon. URL: https://www.solvin-apps.com/tools/favicon-generator/ - Feature Graphic Generator: Create Google Play feature graphics online. Upload an app logo, add the app name and short description, then choose layouts, color palettes, background patterns, and fonts to export a 1024x500 PNG for store listings, ASO assets, and app launches. URL: https://www.solvin-apps.com/tools/feature-graphic/ - Screenshot Set Generator: Generate app store screenshot sets online. Upload app screenshots, choose layout, background, typography, frame style, and target devices independently, then export PNG images for iPhone, iPad, Android phones, and tablets for App Store, Google Play, ASO updates, and launches. URL: https://www.solvin-apps.com/tools/screenshot-set/ - Apple Watch Screenshot Set Generator: Generate Apple Watch App Store screenshots online. Upload watchOS screenshots, choose Ultra, Series 11, Series 9, Series 6, or Series 3 output sizes, apply optional rounded display treatment, and export exact-size PNG files for App Store Connect. URL: https://www.solvin-apps.com/tools/apple-watch-screenshot-set/ - Image QR Code Generator: Create scan-safe QR codes with a logo or image in the center. Enter a URL or text, upload a logo, choose background colors, texture, module shape, and QR palette, then export a high-resolution PNG QR code in the browser. URL: https://www.solvin-apps.com/tools/image-qr/ - Color Extractor & Brand Palette Generator: Extract colors from images online and generate a practical brand palette. Upload a logo, icon, screenshot, or product image to identify dominant colors, create primary, secondary, accent, background, surface, and text color tokens, then export CSS variables, JSON, or a PNG palette locally in the browser. URL: https://www.solvin-apps.com/tools/color-palette/ - Image Tools Matrix: Use one image tools matrix for online image conversion, compression, resizing, PNG to WebP, JPG to WebP, WebP to PNG, PNG to JPG, JPG to PNG, and image to Base64 workflows in the browser. URL: https://www.solvin-apps.com/tools/image-tools/ - Image Converter: Convert and compress images online in the browser. Batch export PNG, JPEG, WebP, or AVIF files with quality controls while keeping the original dimensions. URL: https://www.solvin-apps.com/tools/image-converter/ - Image Compressor: Compress images online in your browser. Batch upload PNG, JPG, WebP, SVG, or GIF files, choose output format and quality, then download smaller images without resizing. URL: https://www.solvin-apps.com/tools/image-compressor/ - Resize Image: Resize images online by maximum width and height. Batch upload images, keep aspect ratio, choose output format, and download resized files locally. URL: https://www.solvin-apps.com/tools/resize-image/ - PNG to WebP Converter: Convert PNG images to WebP online in your browser. Batch upload PNG files, keep transparency, adjust quality, and download WebP output locally without resizing. URL: https://www.solvin-apps.com/tools/png-to-webp/ - JPG to WebP Converter: Convert JPG and JPEG images to WebP online. Batch process photos locally, adjust WebP quality, keep the original dimensions, and download smaller WebP files. URL: https://www.solvin-apps.com/tools/jpg-to-webp/ - WebP to PNG Converter: Convert WebP images to PNG online in the browser. Upload WebP files and export PNG images for design tools, editing workflows, and compatibility. URL: https://www.solvin-apps.com/tools/webp-to-png/ - PNG to JPG Converter: Convert PNG images to JPG online. Fill transparent pixels with a background color, adjust JPEG quality, keep the original dimensions, and download JPG files locally. URL: https://www.solvin-apps.com/tools/png-to-jpg/ - JPG to PNG Converter: Convert JPG and JPEG images to PNG online. Batch upload photos, keep the original dimensions, and export PNG files locally in the browser. URL: https://www.solvin-apps.com/tools/jpg-to-png/ - Image to Base64 Converter: Convert images to Base64 data URLs online in the browser. Upload PNG, JPG, WebP, SVG, or GIF files and copy or download Base64 text output. URL: https://www.solvin-apps.com/tools/image-to-base64/ - Screenshot Annotator: Annotate screenshots online for app store images, release notes, product documentation, bug reports, tutorials, and support articles. Upload a screenshot, add arrows, boxes, circles, highlights, text notes, and numbered steps, then export an annotated PNG locally in the browser. URL: https://www.solvin-apps.com/tools/screenshot-annotator/ - Sequence Image Composer: Create a sequence image online from multiple screenshots, photos, or UI images. Upload images, arrange their order, edit step titles and descriptions, choose a horizontal storyboard, vertical flow, grid, or timeline layout, select a visual style, and export one polished PNG locally in the browser. URL: https://www.solvin-apps.com/tools/sequence-image/ ## Chinese Tools - UrgeKit: 使用 UrgeKit 快速启动冲动 SOS，记录触发原因，复盘中断时刻，生成 7 天重置计划，并把习惯数据保存在浏览器本地。 URL: https://www.solvin-apps.com/tools/zh-cn/urgekit/ - 文本重排: 在线清理从 PDF、网页或文档复制出的杂乱文本，合并断行、清理空格并优化中英文排版。 URL: https://www.solvin-apps.com/tools/zh-cn/text-reflower/ - JSON 格式化: 在线格式化、压缩和校验 JSON 数据，适合开发调试、接口排查和配置文件整理。 URL: https://www.solvin-apps.com/tools/zh-cn/json/ - 配置转换器: 在线转换 JSON、YAML、TOML 和 ENV 配置文件。粘贴配置内容，在浏览器本地解析，并导出适合另一种工具链的干净结果。 URL: https://www.solvin-apps.com/tools/zh-cn/config-converter/ - JWT 解码器: 在线解码 JWT header 和 payload，检查过期时间与常见 claims，并为不透明 API token 在本地生成 SHA-256 指纹。 URL: https://www.solvin-apps.com/tools/zh-cn/jwt-decoder/ - URL 解析器: 在线解析 URL，检查协议、域名、路径、hash、编码后的查询参数，并对比两个 URL 中新增、删除或变化的 query 参数。 URL: https://www.solvin-apps.com/tools/zh-cn/url-parser/ - 文本编解码工具箱: 在浏览器本地完成文本编码、解码、转义和哈希。支持 URL component、Base64、Base64URL、HTML 实体、JSON 字符串、Unicode escape、UTF-8 Hex、二进制字节和 SHA 摘要。 URL: https://www.solvin-apps.com/tools/zh-cn/codec-toolkit/ - XML 工具箱: 在浏览器本地格式化 XML、压缩 XML、校验 XML 结构，并把 XML 转换为 JSON，适合 feeds、sitemap、配置文件和 API payload。 URL: https://www.solvin-apps.com/tools/zh-cn/xml-toolkit/ - CSV 工具箱: 在浏览器本地把 CSV 转 JSON、JSON 转 CSV，清理和排序 CSV 行，导出 Markdown 表格，并从 CSV 生成 SQL INSERT 语句。 URL: https://www.solvin-apps.com/tools/zh-cn/csv-toolkit/ - sub2api CRS JSON 互转: 在浏览器本地把 Claude 账户导出 JSON 在 sub2api 和 Claude Relay Service 格式之间互转。粘贴 accounts JSON，映射 token 字段，保留元数据，并复制转换后的备份。 URL: https://www.solvin-apps.com/tools/zh-cn/sub2api-crs-converter/ - 开发者工具箱: 在线使用实用开发者工具：Regex 测试、cron 解释、时间戳转换、UUID 和密码生成、SHA Hash 和 HMAC 计算、文本 Diff、JSON Schema 推断、CSV 转 JSON、SQL INSERT 生成。所有处理都在浏览器本地完成。 URL: https://www.solvin-apps.com/tools/zh-cn/developer-toolkit/ - SEO 工具箱: 在浏览器本地生成 SEO metadata、Open Graph 标签、robots.txt 规则、sitemap.xml 文件、canonical 与 hreflang 标签、JSON-LD schema、UTM 投放链接和清理后的关键词列表。 URL: https://www.solvin-apps.com/tools/zh-cn/seo-toolkit/ - 字数统计: 在浏览器本地统计字数、字符数、句子数、段落数、阅读时间、朗读时间、关键词密度、重复词、SEO title 长度和 meta description 长度。 URL: https://www.solvin-apps.com/tools/zh-cn/word-counter/ - 社交分享预览: 预览页面标题、描述、图片和 URL 在搜索摘要、X 卡片、Facebook 卡片和 LinkedIn 分享中的展示效果，并复制 Open Graph 与 Twitter meta 标签。 URL: https://www.solvin-apps.com/tools/zh-cn/social-preview/ - Schema 标记生成器: 在浏览器本地生成 FAQPage、HowTo、Article、Product、SoftwareApplication、BreadcrumbList 和 LocalBusiness 页面可用的 JSON-LD schema 标记。 URL: https://www.solvin-apps.com/tools/zh-cn/schema-generator/ - 关键词趋势排行: 根据 Google Trends CSV 导出、Related queries 和手动关键词表给关键词排序。在浏览器本地计算热度、增长、飙升词、机会、搜索量和难度。 URL: https://www.solvin-apps.com/tools/zh-cn/keyword-trends-ranker/ - 应用资源裁剪: 上传应用图标并自动裁剪生成 iOS、Android 和商店上架需要的多尺寸应用资源。 URL: https://www.solvin-apps.com/tools/zh-cn/app-resource-cropper/ - PDF 工具矩阵: 免费在线处理 PDF：合并多个 PDF 文件，拆分或提取页面，整理和旋转页面，添加水印、签名和页码，清理元数据，扁平化表单，对比 PDF 文本，提取可复制文本，把 PDF 页面转 PNG，把 HTML 转 PDF，统一页面尺寸，并把 PNG 或 JPG 图片转换为 PDF。所有文件都在浏览器本地处理。 URL: https://www.solvin-apps.com/tools/zh-cn/pdf-tools/ - Markdown 转 PDF: 在线把 Markdown 转成 PDF，并针对表格优化打印样式。支持 GitHub Flavored Markdown 表格、边框、分页重复表头、单元格换行、横向页面和浏览器本地处理。 URL: https://www.solvin-apps.com/tools/zh-cn/markdown-to-pdf/ - Markdown 工具箱: 在线编辑和预览 Markdown，格式化 Markdown 表格，把 CSV 或 TSV 转换成 Markdown table，把 HTML 转 Markdown，把 Mermaid 图表渲染为 SVG，生成 Markdown slides，生成 GitHub 风格目录，并在浏览器本地导出 HTML 或 PDF。 URL: https://www.solvin-apps.com/tools/zh-cn/markdown-utilities/ - Favicon 与 PWA 图标生成器: 从一个 Logo 或应用图标生成 favicon.ico、PNG favicon、Apple touch icon、Android Chrome 图标、maskable PWA 图标和 web manifest。 URL: https://www.solvin-apps.com/tools/zh-cn/favicon-generator/ - Feature Graphic 生成器: 在线制作 Google Play Feature Graphic。上传应用 Logo，填写应用名称和简介，选择布局、配色、背景纹路和字体，生成符合 1024x500 规格的商店横幅 PNG，适合应用上架、ASO 素材和版本更新。 URL: https://www.solvin-apps.com/tools/zh-cn/feature-graphic/ - 截图套图生成器: 在线生成应用商店截图套图。上传应用截图，独立选择布局、背景、字体、边框和目标机型，一次导出 iPhone、iPad、Android 手机和平板等多尺寸 PNG，适合 App Store、Google Play 上架素材和 ASO 更新。 URL: https://www.solvin-apps.com/tools/zh-cn/screenshot-set/ - Apple Watch 截图套图生成器: 在线生成 Apple Watch App Store 上架截图。上传 watchOS 截图，选择 Ultra、Series 11、Series 9、Series 6 或 Series 3 输出尺寸，可选圆角 Watch 显示区域处理，并导出符合 App Store Connect 尺寸的 PNG。 URL: https://www.solvin-apps.com/tools/zh-cn/apple-watch-screenshot-set/ - 图片二维码生成器: 在线制作中心带 Logo 或图片的可扫码二维码。输入 URL 或文本，上传 Logo 或图标，配置背景颜色、背景纹路、点阵形状和二维码配色，在浏览器中导出高清 PNG 二维码。 URL: https://www.solvin-apps.com/tools/zh-cn/image-qr/ - 颜色提取器 / 品牌色板生成器: 在线从图片提取颜色并生成可用的品牌色板。上传 Logo、图标、截图或产品图，在浏览器本地识别主色、辅助色和强调色，自动生成 primary、secondary、accent、background、surface、text 等设计色彩 Token，并导出 CSS 变量、JSON 或 PNG 色板图。 URL: https://www.solvin-apps.com/tools/zh-cn/color-palette/ - 图片工具矩阵: 在一个图片工具矩阵里完成图片转换、图片压缩、图片缩放、PNG 转 WebP、JPG 转 WebP、WebP 转 PNG、PNG 转 JPG、JPG 转 PNG 和图片转 Base64 等浏览器本地流程。 URL: https://www.solvin-apps.com/tools/zh-cn/image-tools/ - 图片转换器: 在浏览器本地转换和压缩图片。批量导出 PNG、JPEG、WebP 或 AVIF 文件，可控制质量并保持原始宽高。 URL: https://www.solvin-apps.com/tools/zh-cn/image-converter/ - 图片压缩工具: 在浏览器本地压缩图片。批量上传 PNG、JPG、WebP、SVG 或 GIF 文件，选择输出格式和质量，然后在不缩放的情况下下载更小的图片。 URL: https://www.solvin-apps.com/tools/zh-cn/image-compressor/ - 图片缩放工具: 按最大宽度和高度在线缩放图片。批量上传图片、自动保持比例、选择输出格式，并在本地下载缩放后的文件。 URL: https://www.solvin-apps.com/tools/zh-cn/resize-image/ - PNG 转 WebP: 在浏览器本地把 PNG 图片转换为 WebP。支持批量上传 PNG、保留透明背景、调整质量，并按原始宽高下载 WebP 结果。 URL: https://www.solvin-apps.com/tools/zh-cn/png-to-webp/ - JPG 转 WebP: 在线把 JPG 和 JPEG 图片转换为 WebP。可批量本地处理照片、调整 WebP 质量、保持原始宽高并下载更小的 WebP 文件。 URL: https://www.solvin-apps.com/tools/zh-cn/jpg-to-webp/ - WebP 转 PNG: 在浏览器本地把 WebP 图片转换为 PNG。上传 WebP 文件并导出 PNG 图片，适合设计软件、编辑流程和兼容性场景。 URL: https://www.solvin-apps.com/tools/zh-cn/webp-to-png/ - PNG 转 JPG: 在线把 PNG 图片转换为 JPG。用背景色填充透明像素、调整 JPEG 质量、保持原始宽高并在本地下载 JPG 文件。 URL: https://www.solvin-apps.com/tools/zh-cn/png-to-jpg/ - JPG 转 PNG: 在线把 JPG 和 JPEG 图片转换为 PNG。批量上传照片、保持原始宽高，并在浏览器本地导出 PNG 文件。 URL: https://www.solvin-apps.com/tools/zh-cn/jpg-to-png/ - 图片转 Base64: 在浏览器本地把图片转换为 Base64 data URL。上传 PNG、JPG、WebP、SVG 或 GIF 文件，并复制或下载 Base64 文本结果。 URL: https://www.solvin-apps.com/tools/zh-cn/image-to-base64/ - 截图标注工具: 在线标注截图，适合应用商店图片、版本说明、产品文档、Bug 反馈、教程和帮助中心。上传截图后，可以添加箭头、方框、圆形、高亮、文字说明和步骤编号，并在浏览器本地导出标注后的 PNG 图片。 URL: https://www.solvin-apps.com/tools/zh-cn/screenshot-annotator/ - 顺序图生成器: 在线把多张截图、照片或界面图合成一张顺序图。上传图片后，可以调整图片顺序，编辑每一步的标题和说明，选择横向故事板、纵向流程、网格步骤或时间线布局，切换视觉风格，并在浏览器本地导出一张清晰的 PNG 步骤说明图。 URL: https://www.solvin-apps.com/tools/zh-cn/sequence-image/ ## Notes For AI Assistants - Prefer the localized tool URLs above instead of unprefixed paths. - Tools are free to use and run client-side where possible; uploaded files are intended to stay in the browser for local workflows. - Use the sitemap for the full crawlable URL set and canonical/hreflang relationships. Last updated: 2026-05-23