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<script lang="ts">
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import { PDFDocument } from 'pdf-lib';
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import FileDropzone from '$lib/components/FileDropzone.svelte';
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import RasterizationWarning from '$lib/components/RasterizationWarning.svelte';
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import Button from '$lib/components/ui/button.svelte';
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import { downloadBlob } from '$lib/download';
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import { isRasterizationTooLarge } from '$lib/rasterization-limits';
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import { AlertTriangle } from '@lucide/svelte';
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type CompressionPreset = {
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id: string;
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label: string;
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description: string;
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scale: number;
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quality: number;
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};
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const presets: CompressionPreset[] = [
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{
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id: 'strong',
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label: 'Starke Komprimierung',
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description: '~72 DPI, JPEG 50%',
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scale: 1,
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quality: 0.5
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},
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{
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id: 'balanced',
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label: 'Ausgewogen',
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description: '~108 DPI, JPEG 70%',
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scale: 1.5,
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quality: 0.7
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},
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{ id: 'light', label: 'Leicht', description: '~144 DPI, JPEG 85%', scale: 2, quality: 0.85 }
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];
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let pdfFile: File | null = $state(null);
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let selectedPreset = $state('balanced');
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let isProcessing = $state(false);
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let error = $state<string | null>(null);
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let compressedBytes = $state<Uint8Array | null>(null);
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let compressedFileName = $state('');
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const rasterizationBlocked = $derived(isRasterizationTooLarge(pdfFile));
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const handleFileSelected = (files: File[]) => {
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pdfFile = files[0] ?? null;
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error = null;
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compressedBytes = null;
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compressedFileName = '';
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};
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const formatBytes = (bytes: number) => {
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if (bytes < 1024) return `${bytes} B`;
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if (bytes < 1024 * 1024) return `${(bytes / 1024).toFixed(1)} KB`;
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return `${(bytes / (1024 * 1024)).toFixed(1)} MB`;
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};
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const compressPdf = async () => {
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if (!pdfFile) return;
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const preset = presets.find((p) => p.id === selectedPreset) ?? presets[1];
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isProcessing = true;
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error = null;
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compressedBytes = null;
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try {
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const pdfjsLib = await import('pdfjs-dist');
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const { getDocument, GlobalWorkerOptions } = pdfjsLib;
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GlobalWorkerOptions.workerSrc = await import('pdfjs-dist/build/pdf.worker.mjs?url').then(
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(m) => m.default
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);
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const bytes = new Uint8Array(await pdfFile.arrayBuffer());
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const loadingTask = getDocument({ data: bytes });
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try {
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const pdfjsDoc = await loadingTask.promise;
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const outputPdf = await PDFDocument.create();
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for (let pageNumber = 1; pageNumber <= pdfjsDoc.numPages; pageNumber += 1) {
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const page = await pdfjsDoc.getPage(pageNumber);
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const viewport = page.getViewport({ scale: preset.scale });
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const canvas = document.createElement('canvas');
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canvas.width = Math.ceil(viewport.width);
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canvas.height = Math.ceil(viewport.height);
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const canvasContext = canvas.getContext('2d');
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if (!canvasContext) throw new Error('Could not create canvas context');
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await page.render({
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canvas,
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canvasContext,
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viewport,
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background: '#ffffff'
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}).promise;
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const jpegBlob = await new Promise<Blob>((resolve, reject) => {
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canvas.toBlob(
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(result) => (result ? resolve(result) : reject(new Error('JPEG encode failed'))),
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'image/jpeg',
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preset.quality
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);
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});
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const jpegImage = await outputPdf.embedJpg(new Uint8Array(await jpegBlob.arrayBuffer()));
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const originalViewport = page.getViewport({ scale: 1 });
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const pdfPage = outputPdf.addPage([originalViewport.width, originalViewport.height]);
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pdfPage.drawImage(jpegImage, {
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x: 0,
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y: 0,
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width: pdfPage.getWidth(),
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height: pdfPage.getHeight()
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});
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}
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compressedBytes = await outputPdf.save();
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compressedFileName = `${pdfFile.name.replace(/\.pdf$/i, '')}_komprimiert.pdf`;
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} finally {
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await loadingTask.destroy();
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}
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} catch (err) {
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console.error('Compression failed:', err);
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error = 'Fehler beim Komprimieren des PDFs.';
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} finally {
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isProcessing = false;
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}
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};
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const downloadCompressedPdf = () => {
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if (compressedBytes) downloadBlob(compressedBytes, compressedFileName);
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};
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</script>
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<div class="mx-auto max-w-4xl space-y-6">
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<div>
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<h1 class="text-2xl font-bold text-primary-900">Komprimieren</h1>
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<p class="mt-2 text-sm text-primary-700">
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Reduzieren Sie die Dateigröße Ihres PDFs durch Komprimierung.
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</p>
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</div>
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<div class="rounded-lg border border-amber-200 bg-amber-50 p-4 flex gap-3">
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<AlertTriangle class="h-5 w-5 shrink-0 text-amber-600 mt-0.5" />
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<div class="text-sm text-amber-800">
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<p class="font-medium">Hinweis zur Qualität</p>
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<p class="mt-1">
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Das PDF wird neu gerendert, wodurch Text zu Bildern wird. Ausgewählter Text,
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Durchsuchbarkeit und Vektorgrafiken gehen verloren.
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</p>
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</div>
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</div>
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{#if !pdfFile}
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<FileDropzone onFilesSelected={handleFileSelected} />
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{:else}
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<div class="space-y-6">
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<FileDropzone
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onFilesSelected={handleFileSelected}
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label="Anderes PDF ablegen"
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sublabel={pdfFile.name}
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class="py-4"
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/>
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<RasterizationWarning file={pdfFile} />
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<div class="rounded-xl border border-primary-200 bg-white p-4 space-y-4">
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<h2 class="text-lg font-semibold text-primary-900">{pdfFile.name}</h2>
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<p class="text-sm text-primary-700">Dateigröße: {formatBytes(pdfFile.size)}</p>
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<div class="space-y-2">
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<p class="text-sm font-medium text-primary-900">Komprimierungsstufe</p>
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{#each presets as preset}
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<label
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class="flex items-start gap-3 rounded-lg border p-3 cursor-pointer transition {selectedPreset ===
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preset.id
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? 'border-primary bg-primary/5'
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: 'border-primary-200 hover:border-primary-300'}"
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>
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<input
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type="radio"
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name="compression-preset"
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value={preset.id}
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bind:group={selectedPreset}
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onchange={() => {
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compressedBytes = null;
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compressedFileName = '';
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}}
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class="mt-0.5 h-4 w-4"
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/>
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<div>
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<p class="text-sm font-medium text-primary-900">{preset.label}</p>
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<p class="text-xs text-primary-700">{preset.description}</p>
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</div>
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</label>
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{/each}
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</div>
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{#if compressedBytes}
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<p class="text-sm text-primary-700">
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Ergebnisgröße: <span class="font-semibold">{formatBytes(compressedBytes.length)}</span>
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</p>
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{/if}
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</div>
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{#if error}
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<div class="rounded-lg border border-red-200 bg-red-50 p-4 text-sm text-red-800">
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{error}
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</div>
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{/if}
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<div class="flex justify-end gap-2">
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<Button onclick={compressPdf} disabled={isProcessing || rasterizationBlocked}>
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{isProcessing ? 'Wird komprimiert...' : 'Komprimieren'}
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</Button>
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{#if compressedBytes}
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<Button onclick={downloadCompressedPdf}>PDF herunterladen</Button>
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{/if}
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</div>
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</div>
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{/if}
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</div>
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