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Thumbnail Maker

📷 Drag & drop images here or click to select

\n \n

Step 1: Generate Thumbnails

\n \n Thumbnail Height:\n \n
\n \n \n Keep Aspect Ratio\n
\n \n Thumbnail Width:\n \n
\n \n

Step 2: Render and Export

\n \n Output Format:\n \n
\n \n Quality (JPEG/WebP):\n \n
\n \n \n

\n \n

\n Download Thumbnails\n \n

Thumbnail Maker

📷 Drag & drop images here or click to select

\n \n

Step 1: Generate Thumbnails

\n \n Thumbnail Height:\n \n
\n \n \n Keep Aspect Ratio\n
\n \n Thumbnail Width:\n \n
\n \n

Step 2: Render and Export

\n \n Output Format:\n \n
\n \n Quality (JPEG/WebP):\n \n
\n \n \n

\n \n

\n Download Thumbnails\n \n

\n\n\n */\n}\n\nfunction css() {\n /*\nbody {\n font-family: Arial, sans-serif;\n font-size: 16px;\n max-width: 800px;\n margin: 0 auto;\n padding: 20px;\n background-color: #f0f0f0;\n}\n\n#app {\n background-color: white;\n padding: 20px;\n border-radius: 8px;\n box-shadow: 0 2px 4px rgba(0,0,0,0.1);\n color: #333;\n}\n\n#dropZone {\n border: 2px dashed #ccc;\n border-radius: 4px;\n padding: 20px;\n text-align: center;\n cursor: pointer;\n margin-bottom: 20px;\n transition: background-color 0.3s ease;\n}\n\n#dropZone.drag-over {\n background-color: #e0e0e0;\n}\n\n#thumbnailOptions, #renderOptions {\n margin-bottom: 20px;\n}\n\nlabel {\n display: block;\n margin-bottom: 10px;\n}\n\ninput[type=\"number\"], select {\n width: 100%;\n padding: 8px;\n margin-top: 5px;\n border: 1px solid #ccc;\n border-radius: 4px;\n box-sizing: border-box;\n}\n\ninput[type=\"checkbox\"] {\n margin-right: 5px;\n}\n\nselect {\n appearance: none;\n background-image: url(\"data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='12' viewBox='0 0 12 12'%3E%3Cpath d='M10.293 3.293L6 7.586 1.707 3.293A1 1 0 00.293 4.707l5 5a1 1 0 001.414 0l5-5a1 1 0 10-1.414-1.414z' fill='%23333'/%3E%3C/svg%3E\");\n background-repeat: no-repeat;\n background-position: right 10px center;\n padding-right: 30px;\n}\n\nbutton {\n display: inline-block;\n width: calc(50% - 5px);\n padding: 10px;\n background-color: #4CAF50;\n color: white;\n border: none;\n border-radius: 4px;\n cursor: pointer;\n font-size: 16px;\n transition: background-color 0.3s ease;\n margin-top: 10px;\n}\n\nbutton:disabled {\n background-color: #cccccc;\n cursor: not-allowed;\n}\n\nbutton:hover:not(:disabled) {\n background-color: #45a049;\n}\n\n#backBtn {\n background-color: #f44336;\n}\n\n#backBtn:hover {\n background-color: #d32f2f;\n}\n\n#progressBar {\n width: 100%;\n margin-top: 20px;\n height: 20px;\n border-radius: 10px;\n}\n\n#downloadSection {\n display: flex;\n justify-content: space-between;\n margin-top: 20px;\n}\n\n#downloadLink, #downloadMetadataBtn {\n display: inline-block;\n width: calc(50% - 5px);\n text-align: center;\n padding: 10px;\n background-color: #008CBA;\n color: white;\n text-decoration: none;\n border-radius: 4px;\n transition: background-color 0.3s ease;\n}\n\n#downloadLink:hover, #downloadMetadataBtn:hover {\n background-color: #007B9A;\n}\n\n#imagePreview {\n margin-top: 20px;\n text-align: center;\n}\n\n#imagePreview img {\n max-width: 100%;\n height: auto;\n}\n */\n}\n\nfunction js() {\n /*\nconst fileInput = document.getElementById('fileInput');\nconst dropZone = document.getElementById('dropZone');\nconst generateBtn = document.getElementById('generateBtn');\nconst renderBtn = document.getElementById('renderBtn');\nconst backBtn = document.getElementById('backBtn');\nconst progressBar = document.getElementById('progressBar');\nconst downloadLink = document.getElementById('downloadLink');\nconst downloadMetadataBtn = document.getElementById('downloadMetadataBtn');\nconst outputFormat = document.getElementById('outputFormat');\nconst outputQuality = document.getElementById('outputQuality');\nconst thumbHeight = document.getElementById('thumbHeight');\nconst keepAspectRatio = document.getElementById('keepAspectRatio');\nconst thumbWidth = document.getElementById('thumbWidth');\nconst imagePreview = document.getElementById('imagePreview');\nconst thumbnailOptions = document.getElementById('thumbnailOptions');\nconst renderOptions = document.getElementById('renderOptions');\nconst downloadSection = document.getElementById('downloadSection');\n\nlet files = [];\nlet thumbnailCanvas;\nlet thumbnailMetadata;\n\nfunction updateUI() {\n generateBtn.disabled = files.length === 0;\n thumbWidth.disabled = keepAspectRatio.checked;\n}\n\nfunction resetToStep1() {\n thumbnailOptions.style.display = 'block';\n renderOptions.style.display = 'none';\n downloadSection.style.display = 'none';\n imagePreview.innerHTML = '';\n thumbnailCanvas = null;\n thumbnailMetadata = null;\n updateUI();\n}\n\nfileInput.addEventListener('change', (event) => {\n files = Array.from(event.target.files);\n resetToStep1();\n});\n\ndropZone.addEventListener('click', () => fileInput.click());\n\ndropZone.addEventListener('dragover', (event) => {\n event.preventDefault();\n dropZone.classList.add('drag-over');\n});\n\ndropZone.addEventListener('dragleave', () => {\n dropZone.classList.remove('drag-over');\n});\n\ndropZone.addEventListener('drop', (event) => {\n event.preventDefault();\n dropZone.classList.remove('drag-over');\n files = Array.from(event.dataTransfer.files).filter(file => file.type.startsWith('image/'));\n resetToStep1();\n});\n\nkeepAspectRatio.addEventListener('change', updateUI);\n\ngenerateBtn.addEventListener('click', async (event) => {\n event.preventDefault();\n\n if (files.length === 0) return;\n\n generateBtn.disabled = true;\n progressBar.style.display = 'block';\n progressBar.value = 0;\n\n const image0 = await getImage(files[0]);\n const cols = Math.ceil(Math.sqrt(files.length));\n const rows = Math.ceil(files.length / cols);\n const tHeight = parseInt(thumbHeight.value);\n let tWidth = keepAspectRatio.checked\n ? Math.floor(tHeight / image0.height * image0.width)\n : parseInt(thumbWidth.value);\n\n const canvasWidth = cols * tWidth;\n const canvasHeight = rows * tHeight;\n\n image0.revoke();\n\n thumbnailCanvas = new OffscreenCanvas(canvasWidth, canvasHeight);\n const ctx = thumbnailCanvas.getContext('2d', { alpha: false });\n\n let i = 0;\n for (const file of files) {\n const col = i % cols;\n const row = Math.floor(i / cols);\n\n const img = await getImage(file);\n ctx.drawImage(img, col * tWidth, row * tHeight, tWidth, tHeight);\n img.revoke();\n\n i++;\n progressBar.value = (i / files.length) * 100;\n }\n\n thumbnailMetadata = {\n rows,\n cols,\n thumbnailCount: files.length,\n thumbnailWidth: tWidth,\n thumbnailHeight: tHeight,\n canvasWidth,\n canvasHeight\n };\n\n thumbnailOptions.style.display = 'none';\n renderOptions.style.display = 'block';\n progressBar.style.display = 'none';\n renderBtn.disabled = false;\n});\n\nrenderBtn.addEventListener('click', async () => {\n if (!thumbnailCanvas) return;\n\n renderBtn.disabled = true;\n progressBar.style.display = 'block';\n progressBar.value = 0;\n\n const blob = await thumbnailCanvas.convertToBlob({\n type: outputFormat.value,\n quality: outputFormat.value !== 'image/png' ? parseFloat(outputQuality.value) : undefined\n });\n\n const url = URL.createObjectURL(blob);\n downloadLink.href = url;\n downloadLink.download = `thumbnails.${outputFormat.value.split('/')[1]}`;\n downloadSection.style.display = 'flex';\n\n // Display the generated image\n const img = document.createElement('img');\n img.src = url;\n imagePreview.innerHTML = '';\n imagePreview.appendChild(img);\n\n progressBar.style.display = 'none';\n renderBtn.disabled = false;\n});\n\nbackBtn.addEventListener('click', resetToStep1);\n\ndownloadMetadataBtn.addEventListener('click', () => {\n if (!thumbnailMetadata) return;\n\n const metadataBlob = new Blob([JSON.stringify(thumbnailMetadata, null, 2)], { type: 'application/json' });\n const metadataUrl = URL.createObjectURL(metadataBlob);\n const tempLink = document.createElement('a');\n tempLink.href = metadataUrl;\n tempLink.download = 'thumbnail_metadata.json';\n tempLink.click();\n URL.revokeObjectURL(metadataUrl);\n});\n\nfunction getImage(file) {\n return new Promise((resolve) => {\n const url = URL.createObjectURL(file);\n const img = new Image();\n img.revoke = () => URL.revokeObjectURL(url);\n img.onload = () => resolve(img);\n img.src = url;\n });\n}\n\nupdateUI();\n */\n}\n\nconst app = new Hono();\nconst r404 = () => new Response('[112] 404 not found', { status: 404 });\n\napp.get('/serve/112', (c) => {\n const url = new URL(c.req.url);\n const file = url.searchParams.get('f');\n if (!file || file === 'index.html') return serve(html, 'texthtml')(c);\n if (file === 'styles.css') return serve(css, 'text/css')(c);\n if (file === 'main.js') return serve(js, 'text/javascript')(c);\n\n return r404();\n});\n\napp.get('*', r404);\n\nexport default app.fetch;","createdAt",["D",1730752546085],"branchVersion","branchId","4b7be7b6-2781-11f0-b46e-569c3dd06744","id","4b7b9ae0-2781-11f0-b46e-569c3dd06744","vttThumbMaker",["D",1746209671912],"deletedAt","legacyEnvVars",true,"privacy","public","httpPrivacy","description","imageUrl","8d6857d3-cf1c-4e98-a094-0e379c10badf","pinnedFileId","pinPreview","pinMigrated","screenshotVersion","likeCount",2,"orgId","4f4797d6-1767-45ca-8dc5-5113174ca1c1","tursoName","tursoHostname","tursoMeasuredAt","pinned","userPerm","r","valPerm","blobPerm","rw","emailPerm","sqlitePerm","projectPerm","telemetryPerm","user",{"_98":97,"_105":101},"org",{"_98":97,"_99":-5,"_100":101,"_18":55,"_102":103,"_104":25},"branch",{"_13":84,"_32":85,"_43":42,"_86":44,"_87":88,"_89":90,"_91":51,"_92":93,"_94":63,"_95":45,"_96":97},"isOwned",11,"main","projectId","forkedBranchId","45a1169a-2781-11f0-b46e-569c3dd06744","forkedBranchVersion",0,"forkedProjectPrivacy","forkedProjectId","45a0c884-2781-11f0-b46e-569c3dd06744","forkedProjectOrgId","projectName","userHandle","g","handle","displayName","avatar","https://img.clerk.com/eyJ0eXBlIjoicHJveHkiLCJzcmMiOiJodHRwczovL2ltYWdlcy5jbGVyay5kZXYvdXBsb2FkZWQvaW1nXzJqRlBqSjdFTUlTVmVORmpObmFqZmJLVWh5VCJ9","tier","free","canRestrictVals","profileImageUrl","branchName","","adoptOrgId",{"_43":44,"_32":45,"_38":173,"_47":-5,"_48":49,"_50":51,"_52":51,"_53":-5,"_54":-5,"_18":55,"_56":-5,"_57":49,"_58":-5,"_59":-5,"_60":61,"_62":63,"_64":-5,"_65":-5,"_66":-5,"_67":-5,"_68":69,"_70":69,"_71":72,"_73":72,"_74":72,"_75":69,"_76":69,"_77":174,"_79":175,"_81":176,"_83":25},"tree",[164,165],"files",[164,165],"counts",{"_154":90,"_155":150,"_156":90,"_157":158,"_159":160},"contents",[138,139],"upstreamProject",{"_43":93,"_32":136,"_53":-5,"_54":-5,"_50":51,"_77":137},"upstreamBranch",{"_43":88,"_38":130,"_131":132,"_32":85,"_86":93,"_13":133,"_87":-5,"_89":-5,"_134":135,"_47":-5,"_83":25,"_50":51,"_96":97,"_62":63,"_95":136},"emptyEnvVars","flags",[],"hasHttpFiles","grants","orgs","customDomains",{},["D",1746209662089],"updatedAt",["D",1726311743678],10,"lockfileKey","1746245944170-esm.town_v_g_ThumbMaker@10-main","ThumbMaker",{"_98":97,"_105":101},{"_43":147,"_32":148,"_30":149,"_141":-5,"_41":42,"_40":150,"_142":49,"_38":151,"_13":90,"_33":20,"_35":152,"_24":25,"_145":-5,"_27":153},{"_43":140,"_32":28,"_30":31,"_141":-5,"_41":42,"_40":14,"_142":25,"_38":143,"_13":144,"_33":34,"_35":37,"_24":25,"_145":-5,"_27":146},"4ba96cc2-2781-11f0-b46e-569c3dd06744","parentId","latest",["D",1730752546085],8,"label",[28],"4b7e7b70-2781-11f0-b46e-569c3dd06744","README.md","4b7e7bf2-2781-11f0-b46e-569c3dd06744",1,["D",1730741883931],"# Val Town Town: Thumbnail Maker\n\n[Live on VTT!](https://maxm-valtowntown.web.val.run/handler/116)\n\nThis is a port of my\n[Thumbnail Maker val](https://www.val.town/v/g/ThumbMaker)\nfor the\n[Val Town Town Runtime](https://www.val.town/v/maxm/valtowntown)\nby @maxm\nbuild on top of\n[val.town](https://val.town/).\n\nLimitations:\n - On Val Town Town, your application lives on a single route.
\n This means serving multiple assets (main.js, styles.css) does not work the traditional way.
\n In this example, I use a `?f=` query parameter to work around this limitation.\n - Updates to this val are not instantly applied because of caching.\n",[148],"pulls","branches","forks","envVars",{"_161":90,"_163":90},"connections",{"_161":90,"_162":90},"count","unfilledCount","emptyCount",{"_43":147,"_32":148,"_30":149,"_141":-5,"_41":42,"_40":150,"_142":49,"_38":170,"_13":90,"_33":20,"_35":152,"_24":25,"_145":-5,"_167":171,"_27":172},{"_43":140,"_32":28,"_30":31,"_141":-5,"_41":42,"_40":14,"_142":25,"_38":166,"_13":144,"_33":34,"_35":37,"_24":25,"_145":-5,"_167":168,"_27":169},["D",1730752546085],"children",[],[28],["D",1730741883931],[],[148],["D",1746209671912],{"_98":97,"_105":101},{"_98":97,"_99":-5,"_100":101,"_18":55,"_102":103,"_104":25},{"_13":84,"_32":85,"_43":42,"_86":44,"_87":88,"_89":90,"_91":51,"_92":93,"_94":63,"_95":45,"_96":97},"ctx",{"_77":-5,"_127":210,"_211":212,"_213":214,"_215":25,"_216":25,"_217":25,"_218":49,"_219":-5,"_220":-7,"_221":-7,"_222":90,"_223":25,"_224":25,"_225":-5,"_226":25,"_227":25,"_228":25,"_229":-5},"ENV",{"_181":182,"_183":184,"_185":85,"_186":187,"_188":189,"_190":191,"_192":193,"_194":195,"_196":197,"_198":199,"_200":201,"_202":203,"_204":205,"_206":207,"_208":209},"REACT_APP_SENTRY_DSN","https://586020d86f05489db63a554690acf1e9@o1398359.ingest.sentry.io/6724499","RENDER_GIT_COMMIT","e87eb04e707cf64e7e532c8e8ec395f209e17f15","RENDER_GIT_BRANCH","POSTHOG_API_TOKEN","phc_nmoyuAkStEZuUp69rYlg1DZgrIt19Gx0Y4Hwf8tGgJP","POSTHOG_API_HOST","https://wart.val.town","WEB_API_TEMPLATE","https://{val}.web.val.run","APP_URL","https://www.val.town","MODULE_URL","https://esm.town","VANITY_WEB_API_TEMPLATE","https://{label}.val.run/","DENOLS_URL","https://lsp.val.town","NODE_ENV","production","CLOUDFLARE_TURNSTILE_SITE_KEY","0x4AAAAAACtaIZJH7s9rBMZ6","GOOGLE_CLIENT_ID","875989696899-jtsqkhlbdv5jrlsk8631p7ipjg3c6o62.apps.googleusercontent.com","STRIPE_PUBLISHABLE_KEY","pk_live_51N2zvWEpZTTLipIkVEwXrUG9AT0yeOOEYxszarZT1jpsZV58Ly6wlg3SltZpHN26CUalOBmUSY7adQRQiSkCZz2500qSXNkf8Y","API_URL","https://api.val.town",[],"preferencesKeybindings","default","preferencesTheme","light","preferencesFixers","preferencesCopilot","preferencesSelectionAi","preferencesCloseBrackets","preferencesChatPanelState","preferencesDprint","preferencesDenofmt","notificationCount","flagDenols","isBusinessOrgMember","businessOrgHandle","isBusinessOrgAdmin","isHigherTownieTier","navCollapsed","currentOrgId"]

Diff · v9